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Thanks for your query!
Let me have a look for you, and I will get back to you ASAP.
There is also a new ''TPG Mobile APP'' to help you with various trouble shooting and account issues, via a mobile phone app.https://www.tpg.com.au/download
I have checked your NBN-FTTN 50/20 service and i can see it has been up and authenticated for 1 hour now.
Can you recheck the browsing is working.
If u cant tether via wifi, try with a network cable to a device first.