Hi there Appleuser8264,
Please check out the additional steps below to see if those may help resolve this rear camera issue:
Remove case, accessory, or film and test
1. Remove any case, accessory, or film that might block the camera or flash or that places a magnet near the camera.
2. Test the camera by trying to take a photo.
If you want to try more steps on your own
If you prefer, here are some more steps you can try on your own if the camera isn't working. You might still need to contact Apple Support after following these steps.
1. If the photo is blurry, clean the front and back camera lenses with a microfiber cloth. If you see dirt or debris inside the lens, damage to your iPhone near the camera, or if the camera lens appears to be misaligned or blocked, contact Apple Support to discuss service options.
2. If you see motion blur in low-light situations and you use a lens converter, metallic case, or a magnetic lens mount, try removing the accessory.
3. Restart your iPhone, iPad, or iPod touch.
4. Update your iPhone to the latest version of iOS.
5. Test the camera again by taking a photo. If your device has a front and rear camera, check if one or both aren't working. To switch cameras, tap the rotate button
.
Those steps are from this article: If the camera or flash on your iPhone, iPad, or iPod touch isn't working - Apple Support
Another step you can take is to ensure that the apps that are having issues are up-to-date, as that can sometimes help resolve issues. If needed, this article shows how: How to manually update apps on your Apple device - Apple Support
If updating those apps don't help, you can also see if deleting and reinstalling those may help, as it puts a new version of the app onto your iPhone: Delete apps on your iPhone, iPad, and iPod touch - Apple Support
If those steps don't help, then you can contact Apple Support for further help. You can reach out to them with the following link: Get Support
Take care.