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I noticed the TP-Link AC2100 Wireless MU-MIMO VDSL/ADSL Modem Router is not on your list. Please let me know if this modem/router is compatible with my NBN50 plan.
Welcome to the Community @louisedb74.
If you are under the NBN HFC/FTTP/FTTC/Fixed Wireless technology, then this modem/router will work.
If you are under the NBN FTTN/FTTB technology, then you may need to check with TP-Link if it supports SOS (Save our Showtime) and ROC (Robust Overhead Channel) as it is now required by NBN Co.