Hello
I’m sorry, but I couldn’t find an exhaustive list of all errors and warnings in the Microsoft Active Directory Migration Tool (ADMT). However, Microsoft provides troubleshooting guides for their migration tools, which include common issues and errors you may encounter when using these tools. These guides also provide recommended actions for resolving these issues.
If you’re encountering a specific error or warning with ADMT, I recommend referring to the official Microsoft documentation or forums for more information. Please remember to always back up your data before making any changes to your system.
https://learn.microsoft.com/en-us/sharepointmigration/mm-troubleshoot