Unlikely there's any fault, in Auto mode the ELD will kick in when the car detects slip, putting it in offroad and hill descent modes overides this detection - that said the ELD only operates up to 30mph or similar.
Whilst mine’s the earlier 4x4 with ELD button, the ELD light only shows ehen it’s manually engaged or the ELD kicks in, its never on normally.
If you need more advice, please start a new thread rather than tacking on the end of another one, it'll help people with similar questions find the answer easier.