Hello Swen, If you are using KVM, live migration (via UI) of a VM to a different compute offering, regardless of tags, is not supported as only the current offering will be listed. It is also not possible to migrate directly to a compute offering that has distinct host tags. However, with the VM stopped, there is a workaround that involves initially changing the VM to a compute offering without any tags and subsequently changing it to the desired offering. This process does not require the VM to be started with the intermediate offering, both changes can be performed with the VM stopped.
Kind regards, GaOrtiga