Confirming password for admin actions is not possible
If your nextcloud session is a bit older (don't know the number), and you try to perform a sensitive operation -- the example I ran into: removing another user from the admin group -- then nextcloud will ask you to "confirm your password" before continuing. This is not possible in the SSO setting where we either don't know or don't have a password.
This is a known issue for the sociallogin
app, but the author does not consider it a problem as the app is not aiming at SSO apparently :O.
We could try if another SSO app deals with this problem: #1077 (closed) .