I don't know what is that?

[Robinallen38]

Here I have trying to get APS up and running on Azure. Everything seems to be installed correctly but get a 503 error. Think maybe an API endpoint is missing. Does anyone have experience with this? Don't see much about APS and Azure out there. HP Instant Ink

[openpj]

Could you please share at least how you have installed APS and eventually also an error in your application log?

It's impossible to say what could be the problem without seeing any information.