We are trying to use SAML as our authentication method in APEX. When we leave the issuer field blank, the port 80 is being inserted into the authentication callback. Port 80 is being returned in the callback, however, that is not the port that our APEX installation is using. When we enter an issuer in the field, the port goes away, but we get this error coming back:
Invalid value for parameter: /Response/Signature
We are not using Azure, we use Ping Identity.