Sorry I wasn’t totally clear, and I believe we’re working on a bug that might be causing this.
But it might be worth a try to get the app to reset so that Fly Proxy knows how many Machines your app has (right now it thinks there’s 2 Machines, but there’s only 1, which is weird!).
You could destroy the existing Machine:
fly scale count app=0
This will scale the Machines in the default app process down to zero.
Then run fly deploy. This will probably create 2 machines for redundancy. If you really only want 1 Machine, then use fly deploy --ha=false.
I’m hoping, at the very least, that this will make the proxy know how many Machines there are. 