Hi… If you’re seeing this a lot, you can try moving the builder to a less congestion-prone region. There aren’t great docs for doing so at the moment, but the following forum thread has the main idea:
There’s also an env var you can set instead:
https://community.fly.io/t/region-cannot-host-your-machine-fra/23071/31
(These days, you might need to add --recreate-builder and/or --depot=false, on that command line.)
The underlying problem, going by the warning messages you posted earlier, is a transient capacity crunch in that specific region, so it would be best to choose one of the large ones as the alternative…