I was in trouble with same situation and just solved. Here are my solving steps;
1_ Connect your PC with mobile phone network access. Now you are on the same network.
2_ Clear browser cache on PC to see http:X.X.X.X:8080 on your browser.
3_ Open Windows defender firewall and manually add 8080 Port like ;
4_ Read QR from Phone and enjoy ! :D
Hi Gal Verlič,
Please refer the below link for troubleshooting the native issue
Thanks both of you for your answers, I’ve solved this issue couple a few days after I wrote this, my solution was to publish the app to the Mendix Cloud and then open the website on my phone(doesn’t matter if it’s on the same Wi-Fi that way).