I suspect this issue is common to all Realtek 8812AE PCI-e cards, regardless of manufacturer. I knew this was a driver issue since I had previously gotten this card to work on the 5 GHz band before having to do a computer wipe. Actual behavior: Gave an error 'Cannot connect to this network.' Additionally, the connection was intermittent. Expected behavior: Connecting to 5 GHz band gives 'Connected, Secured'. The default drivers that Windows installed didn't allow me to connect to the 5 GHz band, but it allowed connection to the 2 GHz WiFi network.
I'm listing here on Reddit since there isn't much out there on this particular card and this took me forever to figure out. I was having a hard time getting this network card to work correctly on my system (Windows 10 Home 64-bit), but I was able to fix it.