I made a misstake. The instruction says ”Take your thread over the top of the first bar and thread the needle under it.” I did the opposit. I took the thread under the first bar and …
The result wasn’t the same but it looks all right. It is called Wipped Spoke Stitch.
Eventually I figured out how to make the stitch. Here it is:
One petal is sewn in the wrong way but the others are right.