My Existing TPG Modem (TP Link) on FTTB Service, is very poor & does not connect to 5Ghz, So i purcahsed an ASUS RT-AX55 Dual Band Router,  Connected the TPG Modem (LAN) to ASUS Router (WAN), Registered my Router, Whilst entering WAN settings on Router Page (PPPoE) i enter the TPG User Name & password which was provided & the same one i use to login to TPG Webpage, i think this is the problem & it just does not authenticate, Internet light on my Router is still Red. Any suggestions. ... View more