Which FQDN to use when setting up SAML provider for ISE Sponsor Portal

[antcatt]

Hello,
 I started implementing a connection between Entra ID and Cisco ISE following the guide shared by Greg Gibbs (https://www.cisco.com/c/en/us/support/docs/security/identity-services-engine/216129-configure-ise-3-0-sponsor-portal-with-az.html).
I have a question regarding the value of field "Fully Qualified Domain Names (FQDN) and host names".
In there, I put an arbitrary value, different from my nodes FQDN. When I test the portal URL, it returns a DNS error, which seems logical considering I didn't ask to create a record with my arbitrary FQDN. 

I was wondering : 
- Should I use the FQDN of one of my nodes instead of an arbitrary one ?
- If not necessarily, what should I request as parameters for the arbitraty FQDN record ?

Thank you for your help.

[antcatt · Accepted solution]

Quick update on what I have done about it : I noticed the field was not mandatory, I left it blank. The consequence is that the first PAN is selected for the primary link.