iCloud log in problems on startup

Hey guys, whenever I boot up, I got this pop-up : The Mac cannot connect to iCloud due to a problem associated with my email address (see screen capture). I then need to go into Settings, enter my iCloud password, then the 6 digits sent to my iPhone, et finally it works. Does anyone know a fix to this?

Also, iMessage stopped working suddenly. It asks for the logins every time I open the app, but I get no luck : after the 2FA step, it gets stuck and then "a problem occurred". I tried the popular workaround, generating Serial Numbers and Board Serial Numbers, but it didn't help either. Any idea?

Thanks a bunch

https://imgur.com/0cMvGPh

submitted by /u/an_ice_cube
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