Great news 
A few questions about your deployment in order to compare with mine:
- is your server public ?
- what port does it use (22300, 80, 443) ?
- do you use SSL ?
- do you use a reverse proxy ?
Here are the 2 tries I made on macOs http:22300 and https:443:
And on IOS
And on Windows same settings but it works
I run latest versions of IOS/MacOS