Trouble creating Decal Material - Getting Error and Empty Preview

Hi, I’m trying to create my very own first Decal (graffiti to be exact). I’m following instructions on YT for earlier versions (I’m using UE5).

But, I’m getting nowhere. After changing my Material Domain to ‘Deferred Decal’ my preview window goes blank and I get the following Compilation error after trying to save:

The current material has compilation errors, so it will not render correctly in feature level SM5. Are you sure you want to continue.

I’m able to connect the texture mask and I’ll see the preview fine. But it’s after I switch the material to Deferred Decal (so’s I can connect the Opacity mask) that the trouble starts.

Noob here mind you. Thanks.

Wellll, I’ve found old posts citing the same problem and yet with no solution.

Sooooo, IS ‘Deferred Decal’ in fact broken?

or rather, just not ready for prime time yet?