I have tried all the steps mentioned here for my 6 Ledvance Smart+ Wifi bulbs as well - none work in Tuya at the moment.
It doesn’t seem like Osram is interested in continuing the support for Tuya or an API of their own 
I have tried all the steps mentioned here for my 6 Ledvance Smart+ Wifi bulbs as well - none work in Tuya at the moment.
It doesn’t seem like Osram is interested in continuing the support for Tuya or an API of their own