DDNS if disabled and misconfigured, then configured again works, but then it fails and never reports or reconnects. User and password are correct and haven't been changed. I don't.want to use the TPLi

HI I bought an Archer AX3000 to use as a Main Router and then a set x3 Deco X75 to use as Mesh devices to extend the signal. When trying to set up the first Deco the only way it want to be set-up is a