What is the Microsoft Partner Center?
The Microsoft Partner Center is an online platform where Microsoft's partners can manage their relationship with Microsoft, access resources, manage customer subscriptions, and participate in various programs. It serves as a central hub for tasks like managing customer licenses, cloud services, billing, and support, as well as accessing partner benefits, marketing resources, and certifications.
Why do I need it?
It is a requirement for enabling the functionality of the 365 Tenant Manager, as it will syncronhize your tenants and give you the necessary access and privileges for onboarding of services. This will allow you to assign Templates with your preferred Settings and Policies.
"If your customer gives you administrative privileges, you'll be able to deploy and manage subscriptions, maintain performance, set up users, and create support tickets on their behalf. Partner Center provides quick and easy access to Microsoft support on-demand to help you better solve challenges and meet customer needs."
Source: Microsoft
How to Enroll
There is no added charge to enroll and enable the Microsoft Partner Center, in fact you can follow the link here in order to get started.