you cannot access the endpoint with the FQDN of your proxy server. The FQDN has to be the same for the proxies and on the ADFS servers. The clients will know which one to use thanks to a split brain DNS. So when client are connected internally they will
resolve adfs.domain.com to the local IP address of the ADFS server (or the VIP of the internal load balancer if you are using any). And when internet clients are using a public DNS server and try to resolve adfs.domain.com they will end up on the public IP
address of the proxy servers (or again the VIP of a load balancer dedicated for the proxies - aka WAP servers).
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