This site is not secure

This site is not secure

Hi, I have just installed ADSelfService Plus in my test environment with the following settings:

Installed ADSelfService Plus on Win 2019 (Domain Controller)
Installed ADSelfService Plus Agent on the same Win 2019 (Domain Controller)
Configured SSL and enabled 2FA
Only one available user to login

Now when I tried to log in (onto the DC) and entered my usual Windows password, it then said "Unable to securely contact the authentication server for two-factor authentication. Please contact your administrator".

Did I do something wrong with the SSL configuration? How do I login (without the 2FA) to Windows to make the necessary changes to the configurations?

Thanks in advance.

      New to ADSelfService Plus?