Xbox applications can't sign me in to Xbox live with my account

Hello,

I didn't try to sign in to my account for about two weeks. I wanted to sign in yesterday to play Sea of Thieves for the new update.

I'm on Windows 10 and the XBOX application can't sign me in with my main account. I tried with another one and it's completely fine so I think it's specific to my main account.

When I mention "can't sign me in", that's literally what the applications show: "We can't sign you in to Xbox Live right now. Try again in a while. If that doesn't work, we have a few ideas that might help fix the problem". I can try again, to no result. If I switch account, it works fine.

I checked the associated link, but can't find anything helpful. I have no real error message so I'm lost, this error message happened yesterday, and one day later it's still happening right now.

Thanks in advance for your help,

:)