Stick Up Camera & WiFi Extender

Hi All, Newbie to the forum here! My parents have got a stick up door camera and it works fine. However it has a poor WiFi connection so I gave them my TP Link WiFi Extender to improve the signal, however the camera won’t connect to it. When I copy and paste the extender password, the button to connect is greyed out? So I manually typed the massively long password and the connect button is greyed out after I typed the last character so I’m thinking it’s too long but I have no way of changing the extender password… Does anyone have any other ideas? Thank you!