issue retrieving office 365 mail
A few weeks ago I started having issues with the MacOS Mail client not fetching new messages from Office 365. Have tried restarting, refreshing, and even re-initialising the mail app but nothing works reliably. Randomly it will fetch new mail and synchronise either on restart or overnight, but nothing reliably.
Cannot see anything useful in console, and google isn't helping either so I'm out of ideas.
Mail is working fine with other accounts, and O365 is working fine with other clients.
Anyone had this issue before? (and hopefully solved it)