Samsung Galaxy S9+ Display brightness/rotate not working


Just purchased Tasker and really like the possibilities. I am using a Samsung Galaxy S9+ and want to rotate and change display brightness when launching a defined app. But no actions is executed. Also used the ADB Tool (Galaxy S9+ Developer Settings activated, USB Debugging enabled) to send the command to activate android.permission.WRITE_SECURE_SETTINGS like recomended in the guidelines. Still no success. Simple Tasks (like Beep, Pop-Up) work perfectly. Also activated logging - don't see any Errors there.  

What am i missing?

Regards, Martin