(maybe related - could have to do with not getting a public domain automatically?)

Likely, users are not filling out the credentials correctly.

hm those are optional, should work even with wrong values I think

I'll just add default values to them so users dont think it's required to get started

on an unrelated note, would it be possible to make public domain generation automatic?

It is

Just make sure you have a HTTP Proxy Port set in the template composer

ah okay, thanks!