@TP-Link Hi, Here is my Mac info. So Big Sur version 11.0.1. Yes, the other MacBook Pro is also a Mac but the operating system before it (I upgraded to Big Sur in the hopes it would help, it did not)...

Hi all, About two days ago my MacBook Pro decided to stop being able to connect to the internet using the TP-Link AC1200 WiFi Extender (RE300). It appears to be connected (the wifi symbol is filled...