Yeelight Arwen S Ceiling Light - Connection Timed Out

I’ve been struggling to add my new Yeelight ceiling light to the Yeelight app. I’ve reset the light, it picks it up, but the process fails at 100% with a connection timed out issue. If I check my router I can see that the light has been assigned an IP address via DHCP and that it is connected to my network and I can ping the unit.

I’ve tried so many times now and I am stuck. Please can anyone help me.