Cannot create a user after upgrading from V5.9 to version 6.1

[Claudiu-B]

I recently upgraded to version 6.1 and it seems I cannot create a new user anymore, It doesn't seem to matter if I set a password or 2FA :

I also cannot see the user roles anymore in the dropdown menu, on the same user creation page.

I tried to create a user using the python lib:
from lib import ail_users ail_users.create_user('newanalyst','REMOVED','admin@admin.test', 'ORG_UUID_FROM_GUI','user')

And this always returns an error that the org does not exist.

Do you have any idea what the issue could be and maybe extra steps I could take in order to troubleshoot this ? Thank you advance