Understanding the Requirements for and Use of Certificates in Federation
Certificates play an important role in federation scenarios. The Access Edge Server of each federated enterprise must have an MTLS certificate. The MTLS certificate requires that the Edge Servers mutually authenticate. If MTLS authentication cannot be established, there is no communication.
As discussed in Chapter 4, the DNS and certificates provide a strong authentication and encryption channel for data flow between the federated partners. Users will still use TLS, but servers must use MTLS for maximum security.
Note
If your IM servers do not communicate after you put your plan in place, this problem is likely to be caused by a DNS or certificate naming conflict or mismatch. ...
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