Transferring apps requires admin permission for the app you wish to move and the organization you wish to move it to. 

To move the app, go to
Organization > App > Settings > ⋮ > Transfer app to organization

This will open a dialog box for you to select the destination organization and confirm the transfer. More info: https://docs.microsoft.com/en-us/appcenter/dashboard/creating-and-managing-apps#transferring-an-app