ISE 3.2 and AzureAD connection issue

[pio.gra]

Hi, I'm trying to connect ISE 3.2 with AzureAD using this guide: Configure ISE 3.0 REST ID with Azure Active Directory - Cisco but when trying to test the connection I get the following error:

and when trying to save:

What should I check/do to make it work?

[pio.gra · Accepted solution]

Yeah, it appeared to be the firewall issue and after adding some rules - it worked fine, however - I have another issue that I'm not able to retrieve the AD groups...