Cannot create document: Path too long (maximum 260)
This error occurs when there are too many characters in a file path name in OneDrive for Business.
OneDrive for Business now supports file path names with up to 400 characters. Read the Technet Article here.
MigrationWiz has an Advanced Option, IncreasePathLengthLimit=1, that can circumvent this error. The Advanced Option is documented here. Add IncreasePathLengthLimit=1 to your project to allow MigrationWiz to take advantage of the 400-character limit.