After hours of tinkering, I managed to connect my Shelly 1L to the Fritzbox 7490 and control it via the Shelly Smart Home App. It works seamlessly, even remotely. However, this is only possible if I disable the WLAN encryption. Whether it’s WPA+WPA2, WPA2 CCMP, or WPA2+WPA3, as soon as I enable any encryption, the connection drops. Only with the settings: encryption off and all WLAN devices allowed does it work. Any change to these settings immediately causes a disconnection. Running an unsecured WLAN network is not an option for me. I haven’t found a solution yet and hope to find help here. Thanks in advance!