While running a migration, the app returns the following error:
The Central Administration for site [sitename] could not be found.
This error occurs when you have a custom URL (often called vanity URL) for your SharePoint Admin center, and the ShareGate migration tool app cannot locate the admin page.
Any custom domain name that differs from the standard format [name]-admin.sharepoint.com, resulting in the above error message during your migration.
To configure the ShareGate migration tool to point to the correct SharePoint admin center location:
Our support team will provide you with clear, customized instructions on how to configure the ShareGate migration tool for your custom URL.
Note: The support team will likely request a Diagnostic mode report.