Multiple greyed out buttons

I have a spreadsheet that is stored on a Teams page that multiple people can access. I used to have full functionality but now a lot of the buttons are greyed out. On the Review tab, it won't let me select Unprotect Sheet as shown in the attachment. All of the toolbars, Home, Insert, Page Layout, etc. have greyed out buttons. All of the sheets are ungrouped so that doesn't seem to be the issue. Does anyone have any ideas on how to get the functionality back?