Just to confirm, you are using the Yeelight app for this setup? On android there's Yeelight Classic (red icon), Yeelight (purple icon), Yeelight Pro (black icon) and the Xiaomi Home one. I think some of my issue might have been that region lock thing that kept changing a few years back (someone mentioned in another parent here). I remember setting it up on the Yeelight (red) but it eventually had me switch to Xiaomi Home (green app) which then required re-setting it up on another cloud region, which then broke again after a while.
I'll give this python script a try for sure, glad to know you got yours to properly work!
Both the red yeelight classic and green Xiaomi Home is showing as previously downloaded on my iphone. Afraid I don't know which (was years ago) but I'd try red first
...and that too feels on brand for Xiaomi...utter chaos on branding.
I'll give this python script a try for sure, glad to know you got yours to properly work!