Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
The local Office admin in your organization should be able to manage accounts. The admin can contact Microsoft business support, if necessary (see https://support.microsoft.com/en-us/topic/customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2).