My extender can't detect my router

I unplugged my WiFi extender for a week due to my room being renovated and after plugging it in again it won't connect to the internet. I decided to factory reset it and I went through the set up again because WPS doesn't work for me. When setting up and being given the option to choose my existing router it can't get detected. I have reset the router and moved the extender closer but I still get nothing. please help