No informational notifications on some modern Samsung phones
There are reports (1, 2) of informational notifications not being displayed on some Android 10-based Samsung devices (specifically on A50, A31, and Note10+). Apparently also on Huawei. This seems to be caused by the system not displaying notifications during calls, because (according to logs) the app does receive call info and posts notifications without errors.
Please gather and provide adb logs (logcat output) of receiving a call (including system messages, not just the app's ones), if you experience this problem.
This seem to not affect call blocking - it should work anyway.
Edited by Xynngh