Hi om trying to install a new extender TP705X

I cant get a connection to my router.

I have tried vps and the Tether app but nothing works.

When i push ups the wifi symbol starts to flash an after some time

it has a steady light but 2.4 and 5G leds wont light up and after approx 

A minute the wifi led to dark.

 I cant see my device in the Tether app an i can connect my devices to

The extender but no connection to internet.

My router has wifi 6

My old extender works if i plug it in .

Is it possible that the new extender is faulty?

Hope anyone has a quick fix else i will try to get warranty.

Have a nice day now!!!

Kalle