Roku Express+ and Premiere unable to connect to my WiFi when WPA-2 key protected.

When connecting both my Express+ and Premiere to my WiFi, it will only connect if i leave my network unprotected. Once I put my WPA-2 key on to protect it, the Rokus cannot connect to the internet anymore. Yes i am CERTAIN i am inputting the password correctly onto my devices, the devices can only connect to my internet if i leave it unsecured, which i really do not want to do. Any advice would be appreciated.