Unable to change brightness in GH (Yeelight Moon 650)

Hi all,

From the day I purchased the Yeelight Ceiling Light 650 I was able to control the brightness via the Google Home app. Now suddenly I cannot change the brightness via GH, only turn it on and off. The strange thing is that when I ask my Google Home to change the brightness it WILL do it. Only within the GH app it is impossible to change…