It looks like your phone manufacturer is disabling our background processes. Please turn off the battery optimization feature for the app. Here are the steps for that:
Restart your device.
After restarting, go to Settings. Open Battery & Power Usage.
Scroll down and findBlockerX and open it.
Turn off the Battery Optimization feature.
You’ll be able to do it this way. But in case you need instructions specific to your device, then you can google ‘how to turn off battery optimization + [your device name]’ and you’ll find the necessary instructions from there.