Forum Discussion
How to make a copy group form in Microsoft Forms for reusing
Not sure how long this has been in place, but Forms can now be copied that belong to a Group. Under "Group Forms," drill down to a specific team view (you won't see the option while viewing "Recent Group Forms"), and click the three dots--you'll have your copy functionality there.
Topic is quite old, but I would like to share my experience while it's fresh.
Moving a personally owned form under a M365 group is possible. But my goal was to create 20+ duplicate forms that involves 76 questions with complex branching rules under separate teams (or M365 groups if you like). As you can imagine, creating such a form takes quite some efforts (especially branching). Creating 20+ of same is enormous work.
I started with a mistake, by creating initial form under a team. When you create the form under a team Move option won't be available (learned the hard way 
). You can make duplicates under the team (with Copy), but moving outside the team is not possible. Best way I could come up with is to create the form under my work account (not under a group/team) and then make 20+ copies of same with Copy option. Then I moved them under respective team one by one, with Move option.