PAM CLUSTER & SSO with SAML

[MTrucillo]

Hi,
I have a pam cluster with 3 nodes (3.3.2.99) and I'd like to configure SSO auth. (PAM is RP and SSO is SP).
In the past I made this configuration and it worked (The cluster had VIP-FQDN configured [example FQDN.PAM.TLD] butù
embers had nat / fqdn field)blank. Now this configuration not work anymore so I have

• VIP-FQDN: FQDN.PAM.TLD

• FQDN-MEMBER1: FQDN-1.PAM.TLD

• FQDN-MEMBER2: FQDN-2PAM.TLD
  

• FQDN-MEMBER3: FQDN-2PAM.TLD

  so when I type in the browser https://FQDN.PAM.TLD I will redirect to https://FQDN-1.PAM.TLD (or FQDN-2 or FQDN-3)
  

Now how should I change the SAML configuration on the SSO side ?
Do I have to use a different entity ID for each member of the cluster?

Thanks in advance