MBBConnect Connect Failure: error 0x139F

[scout208]

Hi, I'm trying to connect to the AT&T network using my AT&T SIM card and Vodafone (Huawei) K5150 modem on a Raspberry Pi 3 Model B running Windows IoT Core. The problem is my output looks like this:

I know my APN name is correct because I have tested it on my Windows 10 PC with this modem and everything worked. So I'm not sure why I am getting an error here.

[scout208]

It was a roaming issue. I changed roaming settings using

netsh mbn set dataroamcontrol interface=Cellular profileset=all state=all

according to https://docs.microsoft.com/en-us/windows/iot-core/troubleshooting#issue-when-connecting-a-mbm-device-when-roaming and it all worked.