As an ArcGIS Online organization administrator, you must activate your subscription and set up your organization before you can assign ArcGIS Pro Named User licenses. The organization administrator is usually the person who manages ArcGIS Pro licenses, although the privilege of managing licenses can be given to other organization members.
Activate your subscription
To begin, click the activation link in the email you received from Esri Customer Service. Next, follow the steps in the ArcGIS Online help to activate your subscription. If you can’t find the email with the activation link, contact Customer Service for assistance.
The person who activates the subscription automatically becomes the administrator of the ArcGIS Online organization. If you do not intend to be the administrator, forward the email to the appropriate person.
Add members to your organization
After you set up your organization, you can invite and add members to it. Every new member is assigned a user type and a role associated with that user type. A member with the GIS Professional user type is automatically assigned an ArcGIS Pro license. A member with the Creator user type can be assigned an ArcGIS Pro license, but doesn't receive one automatically. No other user types can have an ArcGIS Pro license.