On HDRP 9, enum keywords seem to not do anything. When switching the enum keyword in the editor, nothing happens. Only the first index is ever run. Is this a bug? Am I doing something wrong?
I’ll see if I can get someone to take a look at this post for you 
Do you have a screenshot of your blackboard? What did you input?
Can confirm that this is a bug in Shader Graph which has fixed in the next version of SRP 9-preview!