Add CredentialManagement.is_update_supported

fido2/ctap2/credman.py

@@ -90,6 +90,11 @@ def is_supported(info: Info) -> bool:
             return True
         return False
 
+    @staticmethod
+    def is_update_supported(info: Info) -> bool:
+        # Not supported in credentialMgmtPreview
+        return bool(info.options.get("credMgmt"))
+
     def __init__(
         self,
         ctap: Ctap2,
@@ -229,6 +234,9 @@ def update_user_info(
         :param cred_id: The PublicKeyCredentialDescriptor of the credential to update.
         :param user_info: The user info update.
         """
+        if not CredentialManagement.is_update_supported(self.ctap.info):
+            raise ValueError("Authenticator does not support update_user_info")
+
         logger.debug(f"Updating credential: {cred_id} with user info: {user_info}")
         self._call(
             CredentialManagement.CMD.UPDATE_USER_INFO,