Question unity_InstanceID undefined

Hello.

I'm trying to get procedural instancing to work in shader graph. As far as I can tell, I followed this approach:
https://forum.unity.com/threads/drawmeshinstancedindirect-and-shader-graph.720638/
https://answers.unity.com/questions/1877154/urp-shader-graphs-with-instanced-indirect-instance.html

However, the graph doesn't compile because I use

unity_InstanceID

(as given in the referenced answers). It keeps being undefined. (

undeclared identifier 'unity_InstanceID' at ...

).

I know from the sources that this variable willbe defined ifa couple of conditions are met, having

PROCEDURAL_INSTANCING_ON

amongst others. It is even described here:
https://gist.github.com/Cyanilux/4046e7bf3725b8f64761bf6cf54a16eb

Nevertheless, I did't succeed in getting it to work.
Can someone point me to more secret documentation, or otherwise help me out?
Thank you!

 

Solution:
In "Graph Inspector", I had to remove the leading underscore in field "Reference" from

_PROCEDURAL_INSTANCING_ON

(which was generated when adding the keyword) to the name of the keyword. Then, I inspected the generated code and saw that, for the very first time, I was on the right track regarding the preprocessor definitions. Subsequently, the compiler error mentioned in the original post was resolved.

EDITED: Moved new issue to new thread.