Ever since upgrading to Android 12, when I receive calls I am not able to answer. The screen does not recognize any touch for answering. Any help would be appreciated.
Have you tried wiping the Phone app USER DATA? You can also reset app preferences from reset options. If those don't work and you are bootloader locked, you can flash a full OTA via ADB from Recovery. This method is also called flashing a "rescue OTA". If you are unlocked, then you already know what to do.