I have set up a masking login area on my multisite and as original superadmin when I try to log in I get message:
This features is disabled
On another chat one of the agents suggest creating a second superadmin account via mu plugin.
I still want to use my original superadmin.
When we clear object cache on your host side we were able to log in correctly. After logging out and logging in again (using same original superadmin) the issue is back.