Anvil app server on Azure VM - not responding

I’ve tried a few more attempts to get working, including the various methods of ensuring port 443 is open at a root level but I’m still just getting the “Found Anvil App Server JAR in package directory” message and then the command line returns, with no sign of web serve starting.

I’ve tried to diagnose the issue with this previous forum post:

but to no avail.

Any other tips as to how to diagnose/find log files?

thanks in advance, starting to drive me insane!