To convert an existing ArcGIS Online public account to an organizational account, what invitation method should be used?

To convert an existing ArcGIS Online public account to an organizational account, the most appropriate method is inviting members to join using an account of their choice. This approach allows users to retain the specific account they prefer while transitioning into the organizational structure. By using this method, the system ensures that existing data, configurations, and personal preferences associated with their chosen account are preserved, facilitating a seamless transition into the organizational environment.

The other methods either do not provide the necessary flexibility or may not cater to individual user preferences adequately. Notifying by email or adding members without sending invitations may lead to confusion or loss of individual account history, while automatic addition could overlook user-specific details and lead to complications during the transition. Thus, inviting members to join using their preferred accounts effectively supports a smooth and personalized migration to the organizational framework.