Excel Online Protect Sheet Glitch

Hi All,

I’m using Excel online at my workplace. We use protected sheets because of the amount of people that have access to the workbook.
The issue we are having is that the Unprotected and protect in the review tab is missing. It’s not even greyed out, it’s just fully not there. I’ve typed ‘protection’ in the search bar, it comes up with the option but when I click on it, nothing happens. It’s almost like the option has just disappeared.
The sheets are all locked at the moment so it’s causing issues.
Any help?