Account went offline

I added 4 emails on windows desktop. QR shared to the iPhone app.
One of the account “went offline”

[Exchange Web Services] Synchronizing folder ‘[email protected]/Inbox’ failed due to the following error: The request failed schema validation: The element ‘SyncFolderItems’ in namespace ‘http://schemas.microsoft.com/exchange/services/2006/messages’ has invalid child element ‘NumberOfDays’ in namespace ‘http://schemas.microsoft.com/exchange/services/2006/messages’.