Calls in low light places

[Backsttabb]

When I'm in a call, the screen goes black. Then when I press the power button to turn the screen on, it goes black instantly again. I see the green dot going on and off as the screen goes on and off. But I can't hang up or do anything unless if the person on the call hangs up. 

[user751201tmO21]

Try this
Phone > Settings > Apps
Phone (app you're using)
Force Stop
then
Storage > Clear Cache
... retry

[MochaVex]

If I'm not mistaken, the S21 doesn't have an ambient sensor. It uses the camera to determine whether it's up to your ear or not.

False positive on the system's end

[MochaVex]

Edit, I am mistaken! It has a sensor underneath the display.

Repeat the issue and immediately submit a bug report afterwards

[USBetaModerator]

Hello @Backsttabb  ,

Thank you for your feedback. If you haven’t already, Please update Samsung members app to latest version from galaxy store and send us an error report immediately after experiencing the issue from the Samsung member’s app -> Beta Feedback -> Error Reports to help us debug the issue. We apologize for the inconvenience and appreciate your contribution to the beta program.

Also navigate to settings -> Battery and device care -> Diagnostics , select sensor and press start to run diagnostics. This should check your light sensor for any abnormalities.

Regards,
One UI Beta Team