I need assistance with Single-Sign-On

Good day,
could somebody please enlighten me? I don’t get what I’m missing to get SSO to run.

I’ve been running on Linux/Ubuntu and Apache 2.4.
Now, I’m running a Windows Server 2012 R2 with Apache 2.4 and php7.

LDAP authentication works fine but I don’t have a clue how to bypass the remote_user variable now.

Our WordPress installation is used as a knowledge base for each department.
The users have to login to see the specific instructions they need.

Therefor we are using a User Access Management tool.

I’d appreciate any help regarding this.

Kind regards
Malte Zwillus