So I think I have found the problem -- the "original" TPLink AX73 router (I'll call that router #1), is not writing good backup files. I discovered this by factory resetting it and testing Tether...

@Kevin_Z When I first powered up the replacement router, Tether connected without issue. Then I uploaded my backup configuration file from the first router, this was made immediately after that...

@Kevin_Z I did the factory reset, but it didn't work. I have a replacement unit coming from Amazon late today. Thanks to everyone for the assistance on this problem.

@Dr_Mono Yes, I have power cycled the modem. I have not reset it to factory defaults, but that may be the next thing I do. Honestly, I think it's a bug in the new firmware OR some glitch/corruption...

Hello: After updating my router last evening to the recommended firmware (per the prompt received when I logged into the router), I can still connect to it via the local PC browser interface, but the...

Hello: I recently purchase the AX73 (Archer 5400) router. So far, I'm very happy with its performance and features, except for the HomeShield Pro subscription. IMO, that fee is ridiculous -- this is...