Unusual audio loss on MacBook Pro only.

I have a Mac mini M1 and a MacBook Air that are both updated to Sonoma 14.1. They both will play a recorded tv show from Comcast streaming complete with audio on Safari.

OK. that being said, l updated my wife's MacBook Pro M2 confidently. Oops. Now, the only problem with it is that it will play live shows on Safari, but mysteriously, the recorded tv shows on Comcast will play video but no audio on Safari. It worked on latest Venturi fine, but now for some reason that I can't locate, there is no audio on Comcast recorded streaming tv. All other audio streams work fine. Youtube, podcasts etc. all can function fine.

What could be causing this stand alone problem on just this MacBook Pro? All other apple devices in the home work fine on streaming from the LAN internet. Apple TV, iPhones, Mac mini, MacBookAir. But only the MacBook Pro has the audio issue and only on Comcast recordings when streamed on the Macbook

Thank you very much

Safari is updated with Sonoma 14.1. And Firefox on the MacBook Pro doesn't have this issue. That leads me to believe that it is a Safari issue, but don't have any solution. Safari works fine on the other two systems as noted in the beginning.