I had same problem with my S21. I first tried Google App -> Battery -> Allow background activity
It was not enabled.
Then that didn't work.
Then I went to "Optimaise battery usage" -> All Apps -> disabled the optimisation on Google, Google Assistant (there were two), also google services...
Hi, when I play youtube videos or music, it is of course only coming through the rear speaker.
Is there any way we can get it to play audio through both the front and rear speaker at the same time?