Your migration failed checking Source credentials. Cannot retrieve access token.
Answer:
This error occurs when the access token has expired.
Perform the following actions to generate a new access token:
- In your project, check the box next to the failed user.
- At the top of the screen, click the Clear Credentials button.
- Resubmit the migration. An authentication will be sent to the user via email.
- The user can follow the steps in the email to generate a new access token.