Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
I think I have the same issue as the original poster. It is clear what phone number to call. The automated system at that number asks for an installation id so it can provide a confirmation number to complete phone activation.
Where do I find this installation ID. I tried speaking to a Microsoft support representative but they never heard of an installation ID.
The activation ID is generated by the Activation Wizard as part of the phone activation. I don't know if recent versions of Office actually support the Activation Wizard anymore.