Headlights have to be on. If you have the headlights set to Auto-on, the front fog lights switch will activate the headlights and thereby the front fogs come on as well. But the rear fog lights won't turn on the headlights, and they won't come on either.
Turn on the headlights manually, and you're good to go.
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2021 X3 MC
I work for Keyser Söze
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