In case anyone needs to know this, your 2.4G Wifi router password should not contain any special characters - mine contained a ‘$’ and would not connect through the Smart Life App. Once I modified the router Wifi password to numbers and chars only, the bulbs connected immediately.
I see similar issues with Some smart plugs I’ve been playing with.
Would you mind being a little more specific as to what model you’re talking about? Or does Ledvance only have one Wifi model? Could only find a Zigbee model.