Excel online sheet protection

[Android2020]

I have a spreadsheet that when I try to duplicate a worksheet i get the following error 

this version of Microsoft Excel can't duplicate worth sheets with:

sheet protection  

I am only using Excel web version 

[#2]

Does it give you an error when you open a blank worksheet? If not, copy/paste the entire thing to the new worksheet. Click on the triangle up by A and 1. It will select everything. Do control-C, go to the blank sheet and select cell A1, then Control-V.