One of the benefits of being a “Microsoft Cloud Accelerate” partner is the ability to offer delegated administration right from within your own Office 365 tenant. Delegated administration is you administrering a company account on behalf of one (or more) of your customers. As a delegated administrator, you can perform simple tasks such as adding users and resetting passwords, or more technical tasks such as adding a domain.
Two questions often comes up when delegated administration is on the agenda:
How to invite your customer to authorize you as a delegated administrator
Before you can start administering your customer's account, your customer must authorize you as a delegated administrator. To obtain your customers approval, you first send them an offer for delegated administration:
How to actually do the delegated administration
When you want to perform an administrative task for your customer, you can locate the account by searching for a user (name) or your customers domain name. If you are a delegated administrator for your customer's account, you can search for any domain name associated with the account.
Thats it :-)
Note: As a Microsoft partner, you can see a list of your Office 365 customers on your MPN Partner Dashboard: https://partnerdashboard.microsoft.com/PartnerDashBoard/home.mvc/show/PartnerId=[MPN ID]#/#onlineServicesTab