The RoomWatch camera only supports 2.4GHz WiFi, this error will occur if you try and connect to a 5GHz network.
Some modern routers that have both 2.4GHz and 5GHz bands use a technique called band steering to intelligently move your devices between the 2.4 GHz and 5 GHz network based on usage, speed, coverage and distance. Band steering may cause issues with connecting the RoomWatch camera to the network.
This will require the 2 bands to have different SSIDs. After the camera has been setup on WiFi, the band steering can be set back to the original setup.