As a school admin in IServ:

 

Step 1
Open the IServ administration panel. Then: Administration - System - Single Sign On.

 

Step 2
+ Add - Add OAuth-Client

 

Step 3
Copy the Client ID and Client Secret.

 

Step 4
Click the "Restrictions" tab and activate the scopes there.

 

Step 5
Click the "Application" tab and add "Redirect URIs" with https://www.edumaps.de/sso/iserv (must correspond to your server, so replace www with, e.g., he or nds or nrw). Then save.

 

Step 6
Create a WebModule - Administration - System - Navigation - click + Add - and fill it out as seen in the screenshot - important! Replace he1234 with the username of your Edumaps admin account. Then save!

Example: https://www.edumaps.de/sso/iserv?id=he1234

Make sure to enter the correct Edumaps server here. Instead of "www", use "he", "nds", "nrw", etc.

 

Step 7
Switch to Edumaps. Log in with your admin account.

Go to "My Profile". There you will find a button "Create Single Sign-On". Click on it.

Now enter the IServ-SSO data:

Done.