Everytime I try to open an app from the Power Apps page, I get the error Record is unavailable.
Does anybody know how to get back to my apps?
According to error message, the record may be deleted or you don't have the right privileges to open an app.
Can other users like system admin open an app? If so, you have to be assigned enough privileges to open an app.
I recommend you to create a support ticket for further investigation if the issue is not resolved.
We can investigate the accurate cause from your org ID and Service Request ID.