Just configured a simple azure function and entered the url into the android app, both under app settings and in the tag settings. Changed the frequency to 15 s for testing purposes.
The url is not getting hits (tried both post and get). Tested using the phone browsers and it works.
I think this was already discussed in slack, but for future reference:
The Android handless background tasks and scanning very differently across different Android versions and phone models. We’re working on improving the reliability of the background scanning.