ACC Refused to engage - red pointer

[sVWatt]

Is there an exclamation mark beside the pointer?

No exclamation mark. Just the red pointer, instead of green, or grey.

Could it be that it is the speed limit function, not ACC? I think the ACC button cycles between ACC on, Speed Limit on, or all off.

could well be. I might have toggled that by mistake, as it was working fine today. I’ll keep that in mind and try it deliberately tomorrow to see. Cheers.