We have two servers
1 for ADFS
1 for CRM
The IFD config part is done and our external url https://orgname.mydomain.com works perfectly
The internal url https://crm2016.mydomain.com does not work. If you enter this URL from the CRM server it shows the authentication popup(which it should not) then redirects to our ADFS server correctly https://sts1.mydomain.com/............
But instead of a login screen it shows HTTP 400 Bad request
When I do a setspn -l crm2016admin <this is the user logged in and used to do everything>
I get a list of spns it has
host/sts1.mydomain.com
host/mydomain.com
Am I missing any SPN entry regarding the FQDN of the ADFS server(or Server name)