NOTE: Office 365 Admin pages change frequently, so these screenshots may not match your environment exactly.
1. Navigate to the Global Admin Portal.
Select the Billing > Licenses option from the left navigation window.
Select the corresponding subscriptions and click on the Manage Subscription details just below the license name.
4. Enter 3053859 (OnePlan's Microsoft Partner ID) in the field and click Add button.
5. Repeat steps 3-5 for all remaining licenses such as:
- PowerApps
- Project for the Web (Plan 1 or Plan 3)
- Project Online Professional
- Power BI Pro