It seems to me that if it is listed as part of the order, they really don't have a choice in the matter. (I do not know for others if it is listed, or just expected, but I feel like the way Tesla advertises their product, it is certainly reasonable to expect.) In your case, I would insist they open a repair ticket, and, if not, escalate it, if necessary with the threat of using the arbitration clause (which may also contain an opt-out you might have used and an option to go to small claims.)
For others, including OP, I would check the contract and other documents but would likely pursue similar steps. The best time to catch this is before payment, but I realize it is harder to tell without a physical inspection since Tesla does not commission solar-only systems until PTO, it seems, so you can't see it in the app.