HI again @jscco !
I was able to speak with one of our engineers and they provided some additional guidance I'd love to share.
There is no way to run a test migration, per se, but you can create a backup in 2019, save the backup in a safe location, then initiate the migration to 2022 to see how it goes.
If anything goes poorly, you can restore the backup and continue to use 2019 until you're able to reach support for assistance.
You can find more information on creating and restoring backups here: Back up your QuickBooks Desktop company file
I hope this helps!
