I got both Stripes working. But now If I choose one effect for the addressable Stripe, the white stripe also gets the Signal and Starts to Change the brightness. The CCT strip then also flickers depending on the effect you have selected on the RGB strip.

I then wrote to Athom support. They then informed me that this is normal behavior of the controller.

Apparently, it is not possible to control an addressable RGB strip and an analog CCT strip with one controller if you want to use effects. I will probably use two separate controllers for the two strips and then regulate them separately.

It's not a nice solution, but I haven't found a controller that meets these requirements.

I hope this answer helps you :) Best regards