Creating a Mirrored Database in Fabric

Hi all.

I've managed to create a Mirrored Database on a Fabric Workspace with a free Fabric trial capacity.  However, when i try to create a Mirrored Database on a different Workspace with a Fabric Capacity (that isn't a Trial capacity) i get notification saying i need to upgrade to a Trial capacity.

We have already created Fabric items within that workspace.  We're just trying to create the Mirrored Database where it falls over.

This seems like a bug to me. Either that or Mirrored Databases can only be created on Trial capacity, which seems odd.

Any thoughts would be helpful.

Matt