GL-SFT1200 Wireguard Connecting to GL-MT6000 DDNS -> DDNS Trouble

[MeToo]

Here are a couple posts about trouble with GL.iNet DDNS:
https://forum.gl-inet.com/t/glddns-com-not-resolving/37743/10
https://forum.gl-inet.com/t/ddns-failing-mt6000/39117