Are Subsurface Profiles Disabled?

I was trying to make a light bend effect using a subsurface profile but I cannot find any way to enable it.

I haven’t seen it noted anywhere that its disabled, and it’s both in the materials UI:
image

As well as having an option to create one:
image

Despite these being here I cannot figure out any way to use them or any information on whether or not they’re enabled.

Thanks.
-Lion

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