Apple Configurator won’t touch devices it didn’t configure.
It’s not clear what “reinstalling Apple Configurator 2” means in your question.
Can you review this and see if you need to restore the data needed to supervise that device?
Preserve or migrate data for Apple Configurator
Learn how to back up and restore data from Apple Configurator. You might need to reinstall macOS on your Apple Configurator workstation or migrate to a new workstation. Here’s how to make sure you can continue to supervise the same iOS devices.
I would make a backup of the data you have now and then contact Apple support to review your options. Erasing all the devices is a poor outcome (which will work for sure to start entirely over), but you might be stuck if you don’t have any other backups you could try restoring.
I would make sure Apple validates the version of the tool before you erase the Mac and attempt a restore. In the past, we had mixed results using Time Machine to get a working config and had to set reminders to export this data regularly and keep it secure.