If so try to restart the app. Troubleshooting wemo device issues close all apps that are running in the background then re open the app.

How To Set Up The Belkin Wemo Switch
Wemo devices not detected. Wemo switch not detected sometimes your switches or devices say not detected in the app even though you know they are connected to the wifi. Confirm if your smartphone or tablet has remote access. You can tell this because switch timers work which shows that its connected to the wifi but the app still shows not detected. A factory reset manually on the smart plug unplug wemo smart plug hold down a reset button plug wemo in while holding down the button keep holding down the button for about 5 seconds and release led indicator is flashing for 60 to 90 seconds when you see a led indicator flash alternately blue and. In case the wemo app unexpectedly freezes or becomes unresponsive force close it and then open it again. Try rebooting your router and modem.
Make sure that the wemo device isnt blinking orange see the wifi light status indicator section. If you have unplugged a wemo device the wemo app may still have it registered and may detect it. To know how click here. Wemo device not detected or unreachable if youre having issues controlling you wemo device using the official wemo app we encourage you to try the yeti app and see if reliability improves. Error try again on sign. Your wemo device should be plugged in and connected to the same wi fi where you manage your wemo devices.
Here is a project that shows you just how many things are wide open to the internet. Tried the wemo app on another phone. Wemo dimmer requires the wemo skill. Make sure they are not internet facing if they need to be make sure they are regularly patched firmware updated and get a reputable vendor. For setup instructions click here. Force stopped app and cleared cache.
Also make sure you change the default password. All devices show as not detected in app. In cases where your wemo device is not detected when linking to alexa try the troubleshooting tips below. Uninstall and reinstall the wemo app then repeat the setup process. Took forever to launch still devices show as not detected. If you are able to take your smartphone or tablet to a remote.
Reset or restore your wemo device to factory default settings.