Ok, I managed to solve this problem myself. If anyone ever wondered how the problem was the scale in blender. I had to change it to 0.01 and enlarge the character’s skeleton x100 (of course you have to apply it).
When exporting to FBX, we additionally select “Apply Scalings” to “FBX Custom Scale”, “Forward” to “X Forward” and “Up” to “Z Up”
The last step is to select “Convert Scene” and “Convert Scene Unit” in the UE5 import window.