For reasons that made sense at the time, Machines apps with zero machines set the “suspended” flag on an app - which used to describe a Nomad app that was paused (“suspended”). You can run the deprecated command fly resume <appname> to restore the Nomad app.
We’ve recently noticed a possible regression in migrate-to-v2 since moving our volumes API to a different service, although we’re still investigating the root cause. I’ll try to keep you up-to-date when we have more info to share about that.
In the meantime, feel free to keep it on V1. Now that your app is on nomad again, it should be working just as it was before (after resuming it).