This article explains how to create a service account for migrating Dropbox drives to Google Drive, OneDrive, Sharepoint Sites, Teams, or Blob storage.
Prerequisites: You must be logged into dropbox.com with an administrator account.
Navigate to https://www.dropbox.com/developers/apps
Click on Create App
Select Scoped access, Full Dropbox, enter an app name, and create app.
Go to the Permissions tab, and check the following :
Come back to the Settings tab, then click on Generate:
Copy and save the token for your connector configuration.