I believe this is a Microsoft problem, and it has something to do with Windows. I can access my Outlook mail (at least sporadically) on an Android phone, and new mail (mostly spam) is still coming into my Outlook account. But Outlook on my Windows PC comes back with an error message... server can't be accessed.
Microsoft got hacked in early June... a Denial of Service attack. I suspect that the damage done was much greater than Microsoft has let on, and the access to Outlook problems stem from that. The "Teams" contact synching excuse is a bunch of ****.
I've been unable to access my Outlook account on my PC since AM, June 20. If you can believe Microsoft, they might not fix the problem until at least July 11.
My only suggestion is to try to access your account with a non-Windows device.