diff --git a/changelog.d/12596.removal b/changelog.d/12596.removal
new file mode 100644
index 0000000000..14fbfb3954
--- /dev/null
+++ b/changelog.d/12596.removal
@@ -0,0 +1 @@
+Remove unstable identifiers from [MSC3069](https://github.com/matrix-org/matrix-doc/pull/3069).
diff --git a/synapse/rest/client/account.py b/synapse/rest/client/account.py
index 5587cae98a..bdc4a9c068 100644
--- a/synapse/rest/client/account.py
+++ b/synapse/rest/client/account.py
@@ -882,9 +882,7 @@ class WhoamiRestServlet(RestServlet):
 
         response = {
             "user_id": requester.user.to_string(),
-            # MSC: https://github.com/matrix-org/matrix-doc/pull/3069
             # Entered spec in Matrix 1.2
-            "org.matrix.msc3069.is_guest": bool(requester.is_guest),
             "is_guest": bool(requester.is_guest),
         }
 
diff --git a/tests/rest/client/test_account.py b/tests/rest/client/test_account.py
index e00b5c171c..e0a11da97b 100644
--- a/tests/rest/client/test_account.py
+++ b/tests/rest/client/test_account.py
@@ -520,8 +520,6 @@ class WhoamiTestCase(unittest.HomeserverTestCase):
             {
                 "user_id": user_id,
                 "device_id": device_id,
-                # MSC3069 entered spec in Matrix 1.2 but maintained compatibility
-                "org.matrix.msc3069.is_guest": False,
                 "is_guest": False,
             },
         )
@@ -540,8 +538,6 @@ class WhoamiTestCase(unittest.HomeserverTestCase):
             {
                 "user_id": user_id,
                 "device_id": device_id,
-                # MSC3069 entered spec in Matrix 1.2 but maintained compatibility
-                "org.matrix.msc3069.is_guest": True,
                 "is_guest": True,
             },
         )
@@ -564,8 +560,6 @@ class WhoamiTestCase(unittest.HomeserverTestCase):
             whoami,
             {
                 "user_id": user_id,
-                # MSC3069 entered spec in Matrix 1.2 but maintained compatibility
-                "org.matrix.msc3069.is_guest": False,
                 "is_guest": False,
             },
         )