[khalby786]

>network restrictions on top of the two -factor authentication

That is exactly what I thought was the case too until I recently entered the code Google Authenticator gave me although my mobile was not connected to the internet. And it worked.

[solatic]

If you can even reach the login screen, in spite of a network control that's supposed to exist, then your network controls aren't working.

TOTP is supposed to work without a network connection.