Unable to give apps access to photos/camera

Hello,

Every time I try to use an app that requires my camera and photos, like Instagram or Snapchat, I get a message saying that the app requires access to the phone's camera/photos and to go into Settings to allow access, but when I do, there is no option of the camera/photos shown (see attached screenshots). I'm not even seeing the apps when I go through Settings > Privacy & Security > Photos or Camera.

This is the second time this is happening. The first time I thought this might be because I needed to update my iOS software, so I did, and the problem was gone. No I don't know what the problem is because all my apps are up to date, iOS is up to date, and I have cleared up 8 GB of storage on my phone. I'm using an iPhone 12 Pro.

Not sure what else to do, and part of my job requires my phone and Instagram. Any help is appreciated.