I am trying to get contact information from a Skype for Business 2019 server using the UCWA API. I've managed to get an access token, but when I try to search for a contact I get a 500 error with the message There is a problem with the resource you are looking for, and it cannot be displayed. If I understand correctly this is a general error message and it should be possible to get a better error message. I have access to the server and can change all settings, but don't know where or how. I am a (PHP) programmer with no experience configuring Skype for Business or IIS. Can someone point me in the right direction?