I've found, after configuring the dongles on several devices in the past, that the easiest and least aggravating way to solve the problem is to first hook up the device via an Ethernet cable and get it attached to the OBiTALK web portal, then go into expert mode settings and manually enter the WiFi credentials, submit the settings, and let the device reboot. Then, simply unplug the Ethernet cable, power-cycle the device one more time, and you're on-the-air.
See my screenshot below. While you are there, change the DNS settings to use Google's DNS, to avoid problems with crappy ISP DNS redirects. If you have some sort of anti-Google bias, then use the Quad9 DNS at 9.9.9.9