HTTP 502 error

My app’s URL:

I’m getting a 502 error when trying to access my app. I’m in New Zealand.
I’ve tried a VPN to try other locations eg USA, Hong Kong where I don’t get an error.
The error occurs in NZ and Australia. Wifi and 4g
It’s very frustrating because I’m sitting here about to present the app to my colleagues.


It works here in Vietnam, if that helps.

It started working after a while - sadly after the presentation finished. I was going to pitch my boss to move the app to the paid version. Not much chance of that now. came out looking pretty feeble, and so did I.