Keep screen on while viewing is dependent on the camera having a clear, unobstructed view of your eye movements.  It could be affected by ambient lighting, reflections in eyeglasses or other conditions that may interfere with the camera.  If none of those conditions apply, put in an error report immediately after the condition is replicated.  Then, until it gets sorted out, download Good Lock and the Display Assistant module.  In that module set the app you use to keep the screen on for 10 minutes (max time) and add the "keep screen on for 30 minutes" button to the quick panel.  Using the QP button to keep the screen on for 30 minutes is sufficient for most uses, but, if the screen goes off if you are using it for more than 30 minutes, you can just hit the button again for another 30 minutes.  You can deactivate the action at any time, by either tapping the QP button again, or hitting the side button to turn the screen off, whichever you find more convenient.  This is a workaround until it get fixed.  However, the module is quite useful for keeping the phone screen active for 10 minutes (enough to navigate a voice menu), or 30 if you just like looking at your call screen. ... View more

Did they say there were in the beta? ... View more

All of the buttons are greyed out?  They look active to me.  Or, is it just that the screen is not responding to touch? ... View more

That doesn't really solve the issue about having an opportunity to get into a beta just because Samsung made a mistake.  By the time they correct it, the beta may very well have ended or be full. ... View more

Post in the beta forum. ... View more

I have never had an issue with the feature.  I think originally there was some note in the tips section that the camera must be able to see your eye movement and can be affected by glasses or bright light (or no light).  I do follow regular maintenance routines, such as keeping the screen clean and using the auto optimization scheduled restart feature. ... View more

It may be an issue with the beta that needs to be reported.  Assuming that by "tried everything" means that you have adjusted ambient lighting and that the front camera is unobstructed.  In any case, the display assistant is very useful for things like the phone app to keep the screen from timing out when you need to navigate a voice prompt menu.  It's not necessarily a separate app to take the place of a baked in setting, but in this case may help you if nothing else does. ... View more

It still works for me like it always has.  I am on Android 16, OneUI8.0. Sometimes the front camera may not be able to read your eye movements if there is a bright light shining directly on the screen (including direct sunlight) or if you are in a dark room.  Even a reflection  in your glasses, if you wear them, can cause the camera not see your eyes.  The feature is controlled by the front camera.  You can somewhat alleviate this by downloading Good Lock and the display assistant.  With display assistant you can set certain apps to keep the screen on for up to 10 minutes or add a shortcut to the quick panel to keep your screen on for 30 minutes at a time.   If you have not yet received the latest Google Play system update that removed the cache clearing from recovery mode, try clearing the cache partition. ... View more