Corteza, Federation, and NGINX - x509 Certificate is valid for firewall, not myCorteza system

Hey guys …

Have a docker server with 3 corteza instances currently running in their own containers.

External DNS points to the external IP address, and NGINX takes care of connecting external clients to the correct instance.

When I try to set up Federation between these local instances, I get an error saying:

Failed to pair node: Post "https :// myCorteza01.myDomain.tld /api/federation/nodes/xxxx
x509: certificate is valid for myFirewallName, not myCorteza01.myDomain.tld

myFirewallName is the main system firewall…

Is there anything that can be / needs to be configured with ports, NGINX, DNS, Corteza, firewall that will allow the Federation to connect to the correct instance instead of the firewall??

thanks in advance!