Disable IPv6 or change your DNS server to Google's (188.8.131.52, 184.108.40.206) or OpenDNS's (220.127.116.11, 18.104.22.168). Change it in your devices network settings instead of the router. This may not only be TPG's NBN problem.
Server connectivity issues as in only for the Outlook app or for the whole internet connectivity in general? If you are only having problems with Outlook, try changing the DNS server. If for internet issue, most people on this forum are having problems with it at this difficult time apparently.
If you have changed the DNS server and you are still having problem with only Outlook, let me know, Give me details of the "error".
Hi, I got help to set my network settings on my PC to have Cloudflare as my DNS - I had to do this on my PC and my laptop, and separately on my two android phones, and now they all work fine, and I am using Outlok smothly now.