@OlgaK 

Good day.

Thank you very much for your time and patience.

Did you set up the 850RE via WPS button?

And what is the model number of your home router?

--If it is setup via WPS, please try to reset the extender and set up again via Tether APP or web interface;

Such as https://www.tp-link.com/support/faq/1373/

Thanks a lot.

@Solla-topee  I have the same problem. Says password is wrong but it is correct. I have tried different ways including setting up extender with Tether App. The tp link product is useless. No good whatsoever  and there is no way of contacting support services.

@GH55 

Good day,

Thanks a lot for your time and patience.

Sorry for the delay.

May I know where are you located?

And Did you also have TL-WA850RE v4？

What is the model number of your home router?

After setup, would the signal lit up?

Thanks a lot.