Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Sylvia, Microsoft support for consumers are all via chat. There's no phone number you can simply call.
I can try to help you here if you want. I just need a bit more information first.
On the new computer, can you tell me your macOS version? Also, is your Microsoft 365 subscription purchased from Microsoft, or from Apple?