LineageOS for microG incl. UnifiedNlp vs. LineageOS + UnifiedNlp without microG

I tried to install UnifiedNlp (minimal version for oreo).
Installation via TWRP completed without errors.

However, when I try to open the App, it says App isn’t installed.
I can see the app installed under Settings -> Apps, however I can not open it.

I already manually removed the /system/priv-app/UnifiedNlp folder in TWRP and re-flashed without any success.

Any ideas what could have gone wrong?
What is the proper way to uninstall the app?