2FA - authentication failed in Tester

[sens]

Hi all,

I'm trying to setup 2FA following the guide here:
https://docs.opnsense.org/manual/how-tos/two_factor.html

As I see, only 2 fields are supposed to be filled: Type and Token length.
I did this and then OPNsense was complaining about: "Hostname or IP address" and "Authentication containers".

The former is clear but what about the latter? What are "Authentication containers" and what I'm supposed to put in this field?

I tried with: OU;ODC;DC;CN; and OPNsense stopped complaining, but the tester doesn't work!

BTW
I'm using Authenticator App from Microsoft but it should work with this app too, or not?