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Hi @brianjung541 . That's strange, only 2 devices.
What model is your router?
What type of NBN connection?
What is your plan speed?
When you say only 2 at a time, does that mean 2 ethernet and no wifi, or 2 wifi but no ethernet, or 1 of each?
What happens if you try to connect a third device?
Can you check the DHCP dynamic pool. This usually allows for 100 or more devices to be defined, although not necessarily connect at same time.