In order to create a permission map via a list of users in a CSV please ensure that it follows this strict format:
Source User, Destination User
Permission maps should have two specific entries:
contoso.com, corp.contoso.com. This will instruct Mover to match any users with those domains names in their source email and map them to the destination email.
Please note that Mover will strip all leading and trailing spaces from each path value, unless it is wrapped in quotation marks.
You may be working with an Excel spreadsheet with your users. Ensure you have two columns, one titled Source User, and one Destination User, with the relative domains and usernames listed. You can then export your Excel spreadsheet as a CSV.