AZF5021E Received an enrollCheck request that was malformed or missing parameters
Explanation
A request was made to a valid registration web server URL, but the body of the request was invalid because it was empty. Either a connection to a valid client was dropped by the network infrastructure, or an unexpected client is issuing requests to the web services server.
User response
Make sure that the user's Apple iOS device has network connectivity to the web services server, as described in Enabling users for TOTP authentication.