So I tried what everyone else tried:
Turning off 5Ghz wifi and changing my DNS to Google’s (primary: 8.8.8.8, secondary 8.8.4.4)
But this doesn’t change anything for me and my LED bulb still won’t connect.
In the past I also had some difficulty connecting but got it working once until it disconnected me a few weeks ago.
So now I hope someone has an idea what to do because I can’t return it anymore.
MI ID: 1899256543
edit:
I managed to connect to the Bulb by using the wifi-hotspot of another phone.
Also did a firmware update but this did not change anything.