How to configure Resource Processing in On Demand Migrations
In the Project, select the collection you want to Process Resources for.
In the next screen, click "Select the Accounts".
In the Accounts Screen, click the top box to select all Accounts in the collection.
Click Process Resources.
On the New Resource Processing Task Window select the Resources you wish to process
Note: if processing SharePoint online you need to enable external sharing in Office 365 SharePoint admin center by clicking "Sharing" and selecting "Allow sharing only with the external users that already exist in your organization's directory".
Enter a name for this Task, and verify the settings and Select "Start the task automatically when the wizard is finished."