Can't duplicate to 2nd open databse

I have 2 open databases. I want to duplicate Groups and files from one to another. I have the option in the contextual menu when selecting an item to Duplicate to the 2nd database, but nothing happens when I select it.
I can drag a Group or file from one database to another, but I want to have them in both which is why I want to Duplicate. But can’t.
What am I missing?

I already responded to your support ticket.