Can't add account in Xcode 11

Hi,
I am the maintainer of an adhoc app we use in-house, and every year, we need to update the certificate and re-compile the app.

This year, I encounter a new problem.
It seems I can't add my account to Xcode. (changed computer)
Xcode is at the last version available from the App Store (version 11.6).
I updated MacOS to Big Sur.
The developer account itself is renewed.

What happens, is that from Xcode, I have an unknown error when I try to add the account.
(I checked the ID and password multiple times, and I can login to itunesconnect with it)
The account has the roles "Admin" and "owner".
The developer options are checked on the profile.

Without that, I can't check the application on my iPhone.

I feel that there is something obvious I didn't see yet, maybe I had too long of a day...

Any help on that matter would be greatly appreciated.

Regards,

Cedric Simon
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