diff --git a/launcher/CMakeLists.txt b/launcher/CMakeLists.txt
index 2dfc78b5..25639349 100644
--- a/launcher/CMakeLists.txt
+++ b/launcher/CMakeLists.txt
@@ -224,6 +224,8 @@ set(MINECRAFT_SOURCES
 
     minecraft/auth/steps/EntitlementsStep.cpp
     minecraft/auth/steps/EntitlementsStep.h
+    minecraft/auth/steps/ForcedMigrationStep.cpp
+    minecraft/auth/steps/ForcedMigrationStep.h
     minecraft/auth/steps/GetSkinStep.cpp
     minecraft/auth/steps/GetSkinStep.h
     minecraft/auth/steps/LauncherLoginStep.cpp
diff --git a/launcher/LaunchController.cpp b/launcher/LaunchController.cpp
index 03a68a10..ae88a282 100644
--- a/launcher/LaunchController.cpp
+++ b/launcher/LaunchController.cpp
@@ -239,6 +239,18 @@ void LaunchController::login() {
                 emitFailed(errorString);
                 return;
             }
+            case AccountState::MustMigrate: {
+                auto errorString = tr("The account must be migrated to a Microsoft account.");
+                QMessageBox::warning(
+                    m_parentWidget,
+                    tr("Account requires migration"),
+                    errorString,
+                    QMessageBox::StandardButton::Ok,
+                    QMessageBox::StandardButton::Ok
+                );
+                emitFailed(errorString);
+                return;
+            }
         }
     }
     emitFailed(tr("Failed to launch."));
diff --git a/launcher/minecraft/auth/AccountData.cpp b/launcher/minecraft/auth/AccountData.cpp
index 7526c951..b45d1928 100644
--- a/launcher/minecraft/auth/AccountData.cpp
+++ b/launcher/minecraft/auth/AccountData.cpp
@@ -322,6 +322,7 @@ bool AccountData::resumeStateFromV3(QJsonObject data) {
     if(type == AccountType::Mojang) {
         legacy = data.value("legacy").toBool(false);
         canMigrateToMSA = data.value("canMigrateToMSA").toBool(false);
+        mustMigrateToMSA = data.value("mustMigrateToMSA").toBool(false);
     }
 
     if(type == AccountType::MSA) {
@@ -355,6 +356,9 @@ QJsonObject AccountData::saveState() const {
         if(canMigrateToMSA) {
             output["canMigrateToMSA"] = true;
         }
+        if(mustMigrateToMSA) {
+            output["mustMigrateToMSA"] = true;
+        }
     }
     else if (type == AccountType::MSA) {
         output["type"] = "MSA";
diff --git a/launcher/minecraft/auth/AccountData.h b/launcher/minecraft/auth/AccountData.h
index abf84e43..dd328512 100644
--- a/launcher/minecraft/auth/AccountData.h
+++ b/launcher/minecraft/auth/AccountData.h
@@ -48,7 +48,8 @@ enum class AccountState {
     Online,
     Errored,
     Expired,
-    Gone
+    Gone,
+    MustMigrate
 };
 
 struct AccountData {
@@ -79,6 +80,7 @@ struct AccountData {
     AccountType type = AccountType::MSA;
     bool legacy = false;
     bool canMigrateToMSA = false;
+    bool mustMigrateToMSA = false;
 
     Katabasis::Token msaToken;
     Katabasis::Token userToken;
diff --git a/launcher/minecraft/auth/AccountList.cpp b/launcher/minecraft/auth/AccountList.cpp
index ef8b435d..90efc3b2 100644
--- a/launcher/minecraft/auth/AccountList.cpp
+++ b/launcher/minecraft/auth/AccountList.cpp
@@ -294,6 +294,9 @@ QVariant AccountList::data(const QModelIndex &index, int role) const
                     case AccountState::Gone: {
                         return tr("Gone", "Account status");
                     }
+                    case AccountState::MustMigrate: {
+                        return tr("Must Migrate", "Account status");
+                    }
                 }
             }
 
diff --git a/launcher/minecraft/auth/AccountTask.cpp b/launcher/minecraft/auth/AccountTask.cpp
index 98d8d94d..e6f1cd38 100644
--- a/launcher/minecraft/auth/AccountTask.cpp
+++ b/launcher/minecraft/auth/AccountTask.cpp
@@ -45,6 +45,8 @@ QString AccountTask::getStateMessage() const
         return tr("Failed to contact the authentication server.");
     case AccountTaskState::STATE_FAILED_SOFT:
         return tr("Encountered an error during authentication.");
+    case AccountTaskState::STATE_FAILED_MUST_MIGRATE:
+        return tr("Failed to authenticate. The account must be migrated to a Microsoft account to be usable.");
     case AccountTaskState::STATE_FAILED_HARD:
         return tr("Failed to authenticate. The session has expired.");
     case AccountTaskState::STATE_FAILED_GONE:
@@ -84,6 +86,12 @@ bool AccountTask::changeState(AccountTaskState newState, QString reason)
             emitFailed(reason);
             return false;
         }
+        case AccountTaskState::STATE_FAILED_MUST_MIGRATE: {
+            m_data->errorString = reason;
+            m_data->accountState = AccountState::MustMigrate;
+            emitFailed(reason);
+            return false;
+        }
         case AccountTaskState::STATE_FAILED_HARD: {
             m_data->errorString = reason;
             m_data->accountState = AccountState::Expired;
diff --git a/launcher/minecraft/auth/AccountTask.h b/launcher/minecraft/auth/AccountTask.h
index dac3f1b5..3c1a398a 100644
--- a/launcher/minecraft/auth/AccountTask.h
+++ b/launcher/minecraft/auth/AccountTask.h
@@ -36,6 +36,7 @@ enum class AccountTaskState
     STATE_WORKING,
     STATE_SUCCEEDED,
     STATE_FAILED_SOFT, //!< soft failure. authentication went through partially
+    STATE_FAILED_MUST_MIGRATE, //!< soft failure. main tokens are valid, but the account must be migrated
     STATE_FAILED_HARD, //!< hard failure. main tokens are invalid
     STATE_FAILED_GONE, //!< hard failure. main tokens are invalid, and the account no longer exists
     STATE_OFFLINE //!< soft failure. authentication failed in the first step in a 'soft' way
diff --git a/launcher/minecraft/auth/MinecraftAccount.cpp b/launcher/minecraft/auth/MinecraftAccount.cpp
index ed9e945e..f6909b52 100644
--- a/launcher/minecraft/auth/MinecraftAccount.cpp
+++ b/launcher/minecraft/auth/MinecraftAccount.cpp
@@ -145,6 +145,7 @@ void MinecraftAccount::authFailed(QString reason)
 {
     switch (m_currentTask->taskState()) {
         case AccountTaskState::STATE_OFFLINE:
+        case AccountTaskState::STATE_FAILED_MUST_MIGRATE:
         case AccountTaskState::STATE_FAILED_SOFT: {
             // NOTE: this doesn't do much. There was an error of some sort.
         }
diff --git a/launcher/minecraft/auth/Parsers.cpp b/launcher/minecraft/auth/Parsers.cpp
index 2dd36562..c2f6478c 100644
--- a/launcher/minecraft/auth/Parsers.cpp
+++ b/launcher/minecraft/auth/Parsers.cpp
@@ -247,6 +247,36 @@ bool parseMinecraftEntitlements(QByteArray & data, MinecraftEntitlement &output)
     return true;
 }
 
+bool parseForcedMigrationResponse(QByteArray & data, bool& result) {
+    qDebug() << "Parsing Rollout response...";
+#ifndef NDEBUG
+    qDebug() << data;
+#endif
+
+    QJsonParseError jsonError;
+    QJsonDocument doc = QJsonDocument::fromJson(data, &jsonError);
+    if(jsonError.error) {
+        qWarning() << "Failed to parse response from https://api.minecraftservices.com/rollout/v1/msamigrationforced as JSON: " << jsonError.errorString();
+        return false;
+    }
+
+    auto obj = doc.object();
+    QString feature;
+    if(!getString(obj.value("feature"), feature)) {
+        qWarning() << "Rollout feature is not a string";
+        return false;
+    }
+    if(feature != "msamigrationforced") {
+        qWarning() << "Rollout feature is not what we expected (msamigrationforced), but is instead \"" << feature << "\"";
+        return false;
+    }
+    if(!getBool(obj.value("rollout"), result)) {
+        qWarning() << "Rollout feature is not a string";
+        return false;
+    }
+    return true;
+}
+
 bool parseRolloutResponse(QByteArray & data, bool& result) {
     qDebug() << "Parsing Rollout response...";
 #ifndef NDEBUG
diff --git a/launcher/minecraft/auth/Parsers.h b/launcher/minecraft/auth/Parsers.h
index dac7f69b..db262718 100644
--- a/launcher/minecraft/auth/Parsers.h
+++ b/launcher/minecraft/auth/Parsers.h
@@ -16,4 +16,5 @@ namespace Parsers
     bool parseMinecraftProfile(QByteArray &data, MinecraftProfile &output);
     bool parseMinecraftEntitlements(QByteArray &data, MinecraftEntitlement &output);
     bool parseRolloutResponse(QByteArray &data, bool& result);
+    bool parseForcedMigrationResponse(QByteArray & data, bool& result);
 }
diff --git a/launcher/minecraft/auth/flows/Mojang.cpp b/launcher/minecraft/auth/flows/Mojang.cpp
index 4661dbe2..c60bb851 100644
--- a/launcher/minecraft/auth/flows/Mojang.cpp
+++ b/launcher/minecraft/auth/flows/Mojang.cpp
@@ -2,6 +2,7 @@
 
 #include "minecraft/auth/steps/YggdrasilStep.h"
 #include "minecraft/auth/steps/MinecraftProfileStep.h"
+#include "minecraft/auth/steps/ForcedMigrationStep.h"
 #include "minecraft/auth/steps/MigrationEligibilityStep.h"
 #include "minecraft/auth/steps/GetSkinStep.h"
 
@@ -10,6 +11,7 @@ MojangRefresh::MojangRefresh(
     QObject *parent
 ) : AuthFlow(data, parent) {
     m_steps.append(new YggdrasilStep(m_data, QString()));
+    m_steps.append(new ForcedMigrationStep(m_data));
     m_steps.append(new MinecraftProfileStep(m_data));
     m_steps.append(new MigrationEligibilityStep(m_data));
     m_steps.append(new GetSkinStep(m_data));
@@ -21,6 +23,7 @@ MojangLogin::MojangLogin(
     QObject *parent
 ): AuthFlow(data, parent), m_password(password) {
     m_steps.append(new YggdrasilStep(m_data, m_password));
+    m_steps.append(new ForcedMigrationStep(m_data));
     m_steps.append(new MinecraftProfileStep(m_data));
     m_steps.append(new MigrationEligibilityStep(m_data));
     m_steps.append(new GetSkinStep(m_data));
diff --git a/launcher/minecraft/auth/steps/ForcedMigrationStep.cpp b/launcher/minecraft/auth/steps/ForcedMigrationStep.cpp
new file mode 100644
index 00000000..2e816c92
--- /dev/null
+++ b/launcher/minecraft/auth/steps/ForcedMigrationStep.cpp
@@ -0,0 +1,52 @@
+#include "ForcedMigrationStep.h"
+
+#include <QNetworkRequest>
+
+#include "minecraft/auth/AuthRequest.h"
+#include "minecraft/auth/Parsers.h"
+
+ForcedMigrationStep::ForcedMigrationStep(AccountData* data) : AuthStep(data) {
+
+}
+
+ForcedMigrationStep::~ForcedMigrationStep() noexcept = default;
+
+QString ForcedMigrationStep::describe() {
+    return tr("Checking for migration eligibility.");
+}
+
+void ForcedMigrationStep::perform() {
+    auto url = QUrl("https://api.minecraftservices.com/rollout/v1/msamigrationforced");
+    QNetworkRequest request = QNetworkRequest(url);
+    request.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
+    request.setRawHeader("Authorization", QString("Bearer %1").arg(m_data->yggdrasilToken.token).toUtf8());
+
+    AuthRequest *requestor = new AuthRequest(this);
+    connect(requestor, &AuthRequest::finished, this, &ForcedMigrationStep::onRequestDone);
+    requestor->get(request);
+}
+
+void ForcedMigrationStep::rehydrate() {
+    // NOOP, for now. We only save bools and there's nothing to check.
+}
+
+void ForcedMigrationStep::onRequestDone(
+    QNetworkReply::NetworkError error,
+    QByteArray data,
+    QList<QNetworkReply::RawHeaderPair> headers
+) {
+    auto requestor = qobject_cast<AuthRequest *>(QObject::sender());
+    requestor->deleteLater();
+
+    if (error == QNetworkReply::NoError) {
+        Parsers::parseForcedMigrationResponse(data, m_data->mustMigrateToMSA);
+    }
+    if(m_data->mustMigrateToMSA) {
+        emit finished(AccountTaskState::STATE_FAILED_MUST_MIGRATE, tr("The account must be migrated to a Microsoft account."));
+    }
+    else {
+        emit finished(AccountTaskState::STATE_WORKING, tr("Got forced migration flags"));
+    }
+
+}
+
diff --git a/launcher/minecraft/auth/steps/ForcedMigrationStep.h b/launcher/minecraft/auth/steps/ForcedMigrationStep.h
new file mode 100644
index 00000000..8b9cbbbc
--- /dev/null
+++ b/launcher/minecraft/auth/steps/ForcedMigrationStep.h
@@ -0,0 +1,23 @@
+#pragma once
+#include <QObject>
+
+#include "QObjectPtr.h"
+#include "minecraft/auth/AuthStep.h"
+
+
+class ForcedMigrationStep : public AuthStep {
+    Q_OBJECT
+
+public:
+    explicit ForcedMigrationStep(AccountData *data);
+    virtual ~ForcedMigrationStep() noexcept;
+
+    void perform() override;
+    void rehydrate() override;
+
+    QString describe() override;
+
+private slots:
+    void onRequestDone(QNetworkReply::NetworkError, QByteArray, QList<QNetworkReply::RawHeaderPair>);
+};
+