"Unable to access Team xxx SharePoint site. Check the team name length. This cannot be longer than 247 single byte characters. If the team was recently created, retry migration after a minimum wait of 5 minutes."
This is due to a SharePoint name character length constraint in the Microsoft system.
Verify that the SharePoint site is functioning properly on the Source, then either retry or skip using the Advanced Option
SkipUnprovisionedTeamSites=1 to skip these sites at the Source.
- This option is added to the Support Options in the Advanced Options page.
- This Advanced Option does not work for the Destination.