Does your router have WLAN with 2.4 and 5 GHz?
To set up the brennenstuhl®Connect products, it is imperative that the product and the mobile end device are in the 2.4 GHz network. We recommend switching off the 5 GHz network during installation, as the mobile end device cannot connect to the WiFi product if the smartphone is in the 5 GHz network. The brennenstuhl®Connect WiFi products work with a 2.4 GHz WiFi module and can therefore only be registered to 2.4 GHz networks.