I've been looking at every thread possible. I tried a multitude of the suggestions, but this is what worked for me: Apparenlty, somehow
the permissions to the WindowsApps folder (a hidden folder) got screwed up for the Users group.
File Explorer - Show Hidden Folders - Go to Program Files\WindowsApps - Right Click Select Properties - Select Security Tab - Select Advanced - Change the owner to Your
Administrative Account Name - Once you have ownership access, delete the Users principal reference and it's associated permissions - Re-Add the Users group to have Read & Execute, List Folder Contents, &
Read - Change the owner back to TrustedInstaller. At each point allow permissions to propagate to subfolders and files, etc.
I hope I explained it well enough. This is my recollection of what I did and what seemed to work for me. I hope that it works for you.
Caveat: I did uninstall the Photos app and reinstall it several times in advance of the above solution. That may or may not have had an impact on my ability to solve the
problem using the solution above. So, one may need to do that if the above doesn't solve the problem outright.