Unable to create a Latest Comment column as greyed out. How can I fix?

We had a Latest Comment column but the Column Type wasn't accurate. Showing as a Text / Number type. I tried to resolve this and I get the error "There is already a Latest Comment column in the sheet".

To try to resolve, I created another column and deleted the original. However this still hasn't fixed the issue.

There are no hidden columns and I have checked that NO columns have the "type" as Latest Comment.

Can anyone advise how to resolve.


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