Hi… Fundamentally, volumes are tied to particular physical hosts, and the above message is (likely) saying that the one that you’re on is already full with other people’s (running) Machines.
You could try to just wait it out a little longer and see if the congestion clears up eventually.
This is a disruption that the recommended 2+ Machines configuration would have spared you, as a bit of platform-philosophy context.
Alternatively, you can manually fork the volume, which should place a copy on a different physical host.
I’m admittedly not sure whether fly scale would still try to use the older one; if so, you might need to delete it (unfortunately).
Hope this helps!