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For some reason the EEVEE viewport is actually rendering the smoke simulation, however, on the actual render, it does not seem to render it at all as if it's excluding it.
I have checked Volumetrics on, so I'm quite stumped here.
Make sure you add the Principled Volume shader to the Volume not Surface in the Material on the Smoke Domain (not the emitter), that did it for me
If that doesn't work compare your system to the F3->'Quick Smoke' with a cube selected
Required, but never shown