Create a Microsoft Partner account user

We recommend that you use a partner account that has Admin Agent permissions to your customer accounts. After you have an account that can access your customer tenants via the Partner Center, you can grant consent to Sync 365 License with that account to automate your Office 365 billing.

Adding an account with Partner Center Access

This link provides details on assigning an account permissions in your partner centre, or you can use the short steps after to complete this.

https://docs.microsoft.com/en-us/partner-center/permissions-overview

The short steps to do this are

1. Log in to the partner centre https://partner.microsoft.com/en-us/pcv/dashboard/overview
2. Click the settings cog in the top right and select “User Management”
3. Select the user you want to use from the list
4. Set the permission for “Assists your customers as” and select admin agent

Update the account and it is ready for use