As you and your wife are connecting to the gadget (presumably a WiFi router ?) then the issue will more than likely lie with your granddaughters phone or even the router - check the manual or search it online, it may only allow two devices to connect to it any one time, which would be unlikely, but as you nd your wife can successfully connect to the gadget, then the issue probably lies with your granddaughterโs phone, or the gadget only allowing two connections at any one time.
Also, double check the password is being entered correctly.
