Drush 10 sql-sync and multi site --uri not working

I am doing some D8 to D9 migrations and having a problem with a multisite. I upgraded my local version to drush 10 as well as on my dev server and included the drush/sites/us2.site.yml file.

I can sql-sync the default db no problem, but when I try and specify a --uri it still targets my default database.

drush sql-sync @us2.dev @self says it will replace us2_local with us2dev which is correct.

drush sql-sync @us2.dev @self --uri="reports" says it will replace us2_reports_local with us2dev. That is incorrect. The source DB should be a different database in this case. It did get the target database correct as my local db is us2_reports_local.

if I do drush @us2.dev status database points to us2dev

if I do drush @us2.dev status --uri="reports" it shows the correct us2 reports db so status seems to work, but not sql-sync

Any ideas? I feel like I am missing something obvious. I am still on the latest version of drupal 8 until I get the modules up to date.