Insert Comment option is missing from right-click menu

I am using Excel 2016 on Windows 10. Today, the "Insert comment" option disappeared from the right-click pop-up context menu. When I right-click on a cell with no comment, there is no option to add one. If I right-click on a cell with a comment, I can edit or delete the comment. On the Insert tab of the ribbon, the Comments section is grayed out. This problem is affecting all spreadsheets that I have tried.

I googled the problem and tried every solution offered but none of them worked. How can I add comments to cells again?

Thank you

I too have this problem - even today 4th Nov 2020.

It is very convenient to use right click than remembering the function keys.

Please resolve the issue.

Thank you.

I used all provided way to solve the problem but I can't comment still.

You need to right click the cell and then check on edit objects and edit scenarios before protecting the cells you want to protect.

I don't have " Set print area" button when rt click?

I just found that if you copy a cell that had a comment into a blank cell, you can edit the comment to enter new info. 

I have found another solution ! None of the above were working, not even [SHIFT + F2]. Go to any empty cell that does not have any comment at present. Right click, select "Set Print Area", left click. Now press the [cancel] button.

Hey presto - the facility to enter / edit / delete comments has returned to the whole sheet ! I suspect that the facility to add / edit comments was accidentally turned-off by pressing the "Set Print Area" option in error previously ?