An option would be fine. But currently, it seems that I cannot duplicate locked items at all. And that breaks my favorite workflow… Or did I miss that option somewhere?

I select the option and press ctrl+d or click the duplicate button in the context menu.

Our company recently encountered this problem in a devastating way. We teach online courses using Miro. Our students were unknowingly duplicating the locked backgrounds of our Miro board. It made the board unusable and caused such a mess that the class needed to be ended and re-scheduled. A locked object should not be duplicatable without first unlocking the object—no matter the user’s permissions level. 

I also believe that locked items should NEVER be able to duplicate. It just makes no sense.

Why should anyone should be allowed to duplicate locked content? There is a reason why it is locked, namely to prevent messing around (shifting, overlaying, editing) of this content.
If this now is duplicated, this 99% of the time happens accidently, which destroys the complete workflow (and, as you can read here, also a complete training)

Thank you, everyone for your thoughtful comments about this feature.

Our team is reviewing this idea as it continues to be open for votes and comments. For those coming across this idea, if you feel this would be helpful for you or your business, please be sure to vote for it and leave a comment about your use case to help our team scope this request.