These days, support rarely provides a new key in this situation. When Office 2011 was still in service, you could call Microsoft Support and plead with them for a new product key in a situation such as yours. If you had used Apple's Migration assistant before you uninstalled from the old device, I think your license would have been automatically migrated to your new device. If Office sees such a change, it prompts for activation with a new product key.
A change in hardware, changing the startup volume hardware in particular, signifies that the install is no longer runningĪs licensed.
When you have a perpetual license, Office checks the hardware it is installed on to verify that the original owner is using the software.