I had a hard time resetting and pairing my TP-Link power adapters today using the physical buttons after my adapter and Wi-Fi extenders were mysteriously unpaired, and I could not connect to the Internet. After checking the Internet for the solution and some trial and error, I successfully reconnect to the Internet via the Wi-Fi extender.
For those who encounter a similar issue and the reset buttons fail to work, here is my solution using software reset and pairing:
Preparation
1. Connect the computer directly to the router.
2. Download and install the utility here:
https://www.tp-link.com/sg/support/download/ (e.g. Powerline Adapters).
3. Take photographs of the back of the adapter and extenders that show the PowerLine Key, put back the adapters to the power sockets near one another and switch on the power.
Utility Reset and Pairing
4. Launch the utility on the computer and scan for the main PowerLine adapter (TL-PAxxxx) and Wi-Fi extenders (TL-WPAxxxx).
5. Click on the main PowerLine adapter that shows up in the utility and click on the web browser icon. Enter the username and password as "admin" and reset the adapter.
6. Use the "+" icon to add the Wi-Fi extender, then enter the PowerLine Key in step 3, then reset it using the step 5 method. You can also use this method to add the power adapter manually if the scan fails.
7. Once all the adapter and Wi-Fi extenders are reset, the utility will show them paired up in a simple diagram with the Wi-Fi speed.
From the utility, I can see that although I'm using AV600 series, the speed is only close to 300 mbps via Wi-Fi (as advertised). However, this is more than sufficient for MS Teams and Zoom meetings.
https://www.tp-link.com/sg/home-networking/powerline/tl-wpa4220kit/