Too few arguments to function drush_migrate_tools_migrate_messages() I'm in the middle of a D7->D8 migration and tried running the command drush migrate-messages but got the following error: 

ArgumentCountError: Too few arguments to function drush_migrate_tools_migrate_messages(), 
0 passed in /mysite/vendor/drush/drush/includes/command.inc on line 422 and exactly 1 
expected in drush_migrate_tools_migrate_messages() 


but I've never had this error before running the same command and can't find anything in the documentation about it.
The Examples section makes it pretty clear. drush migrate-messages expects one parameter, the machine name of your migration for it to display the migration messages. There's no "show all" option. Run drush migrate-status to see all migration machine names (left column) available.