Domain Rewrite - Could not find migration (4382304)

Error 'Could not find the migration' when uploading a CSV for user matching.

Possible Causes:

1) Users not discovered for the Domain Rewrite project.

2) Users are Mail Users but do not have a mailbox. 

Make sure users are mailbox-enabled.

If users are recently created and/or not displayed in users list,  please run discovery for the environment with delta timestamp set to before the users creation date or project creation date.

The following is the steps

1. At the Domain Rewrite project, click Settings > Environments.
2. Select the environment and click on Delta Timestamp date and you can select the previous dates. 

Once the users has been discovered, the account with the mailbox enable will be displayed in the Domain rewrite users list and/or can be matched.