Problem signs Outlook refuses to load, or a sign in window loops, opening and closing quickly. Outlook refuses to connect or send / recieve mail. The Windows store refuses to open. These are the initial symptoms I have seen when the AAD token broker ‘breaks’ for lack of a better term. Event ID 1098 will be logged repeatedly in the Microsoft-Windows-AAD/Operational event log. The fix Microsoft has a couple troubleshooting articles on event 1098 Event 1098 Cannot Create New Profiles and Event 1098 Error 0xcaa5001c .