OK, THE MODEL I JUST WASTED $168 ON IS NOT EVEN LISTED, SO I JUST THREW A DART.  THIS IS THE SECOND TP LINK PRODUCT I HAVE BOUGHT TO FILL THIS NEED.  BOTH HAVE FAILED.

I'VE HAD IT UP TO HERE WITH TP LINK.

I AM THE ASHAMED OWNER OF AN  AX5400, AKA THE ARCHER AX73.

I RETURNED THE FIRST ITEM (CANNOT REMEMBER THE MODEL), ASSUMING IT WAS A ONE-OFF SITUATION.

LOOK, IT'S REALLY SIMPLE.  IT'S NOT ROCKET SCIENCE, AND IT'S NOT 1993.

WE HAVE A WIFI NETWORK ON THE PROPERTY, I'LL CALL IT "ABC."  AND A PASSWORD, I'LL CALL IT "123."

WE NEED TO EXTEND OUR WIFI COVERAGE TO THE OTHER END OF THE PROPERTY.  I HAVE BURIED 150 FEET OF CAT 5E UNDERGROUND RATED CABLE TO THE LOCATION.  PREVIOUSLY, WITH AN ASUS AC1900 WIFI ROUTER IN AP MODE, WE GOT 40O MBS, VIA WIFI.  THAT UNIT BIT THE DUST AFTER YEARS OF GOOD SERVICE, SO WE HAVE TO REPLACE IT.

TP LINK IS TELLING US THAT THE UNIT WE JUST BOUGHT "IS NOT RECOMMENDED FOR CONFIGURING WITH THE SAME SSID AND PASSWORD AS AN EXISTING NETWORK."  INDEED, I HAVE CONFIGURED IT WITH "ABC" AND "123," AND IT DOES NOT WORK.  WHEN I PLUG A LAPTOP INTO THE ETHERNET PORT I'M USING, IT'S 600 MPS.  (WE HAVE A FIBER ISP.)

WHY WOULD ANYONE SELL SOMETHING WITH "ACCESS POINT MODE" THAT DOES NOT EXTEND AN EXISTING NETWORK?????????  ISN'T THAT WHAT ACCESS POINTS DO??????????

WHAT AM I DOING WRONG??????

I AM REALLY USING EVERY OUNCE OF MY SELF CONTROL TO KEEP IT CLEAN HERE.

THANKS TO ANYONE WHO CAN HELP.