SharePoint Online Append-Only Comments field is duplicated every time Microsoft Flow runs

Question

I have created a Flow which updates various fields in my SharePoint Online list, one of them being an Append-Only Comments field. This comment field is only updated sometimes. In scenarios where I don't want to add a new comment, the comment from the previous run is duplicated with a newer timestamp.

How can I avoid this occuring in Microsoft Flow?

Answer 1

In the cases where you do not want to update the comments field in Flow, Try using a dynamic expression to explicitly set that column value to null in the Item Update.