Your best solution is to use the B4A-Bridge.
First Reboot you router, phones, tablets and computer to make sure that everything is refreshed. Make sure that you have installed the latest B4A-Bridge by Anywhere Software from the Play Store, run B4A-Bridge on your device and tap on Start, now start B4A on your computer and use the drop-down menu to connect to B4A-Bridge on your device. Open your program and to to the designer, use the drop-down menu to connect the designer to B4A Designer installed on your device.
Test your app in Debug mode, and that's it...