BBQ - 4T not connecting to Wi Fi

When I unboxed the unit it connected to the WiFi straight away. I have tried everything since and can’t connect up to the WiFi. This is so frustrating!!!

May I know which app you are using, is it the INKBIRD app? Or the Inkbird pro app?
Please check if the router is set up correctly? Please understand that the router settings will also affect the connection of the device.