phots not going to my photo stream

Did you just upgrade to iOS 15.4? The upgrade may have changed the Camera Settings.

Please check the Settings > Camera > Formats. Set it to "Most Compatible", if it should be set to "High Efficiency".

Then try again to take a normal photo (not Live, not a video) and see, if it will appear in my Photo Stream.

In another discussion a user reported that Apple support told them, that previously photos taken in the HEIC format have been automatically converted to JPEGs when being added to my Photo Stream, and this is no longer happening on iOS 15.4. So we have to avoid taken photos in the HEIC format, if we want to use My Photo Stream, until this will be fixed by Apple.

I have similar issue. Any/all sscreenshots made are correctly transfered to my photo stream but none of photos taken with the camera are transfered to the photo stream. Have you tried making screenshot, if it appears in photosteem?

In that case enabling the “most compatible” described above setting should really solve the problem. Enable it, take a photo and check if the photo appears