Hier mal ein Auszug aus dem OAuth request log :
[2020-08-14 08:13:20] openid.DEBUG: GET /egroupware/openid/endpoint.php/authorize?scope=openid+profile+email&response_type=id_token&client_id=guacamole&redirect_uri=https://glpi.peiker-holding.de/guacamole/&nonce=o2dh8pl6i6v5eu93cavbpiu76q HTTP/1.1
Connection: Keep-Alive
X-Forwarded-Server: glpi.peiker-holding.de1
X-Forwarded-Host: glpi.peiker-holding.de1
X-Forwarded-For: 192.168.16.183
X-Forwarded-Proto: https
Upgrade-Insecure-Requests: 1
Cookie: eGW_cookie_test=enabled; sessionid=qq3f95np6r31d9e25u7e2ven8r; kp3=FKcVFS2yBQgjAOy6OCrpOKjQ; domain=default; last_loginid=gregor.burck; last_domain=default
Referer: https://glpi.peiker-holding.de/guacamole/
Dnt: 1
Accept-Encoding: gzip, deflate, br
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,/;q=0.8
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:79.0) Gecko/20100101 Firefox/79.0
Host: glpi.peiker-holding.de1
Content-Length:
Content-Type:
[2020-08-14 08:13:20] openid.DEBUG: HTTP/1.1 401 Unauthorized
Content-Type: application/json
{“error”:“invalid_client”,“error_description”:“Client authentication failed”,“message”:“Client authentication failed”}