Move objects on Azure is not simple. Move between Tenants is extremely difficult or not possible. I faced the challenge to move a virtual machine and disks between tenants recently and found the solution.
Some Years ago, I wrote an article about the Azure Resource Mover when it was still being created. Today the resource mover is integrated with the entire azure portal, although there are already many limitations in relation to moving resources. Anyway, this will not affect us on this blog post.
Click through for the step-by-step, as well as a few gotchas you might run into along the way.