How do I fix 400 Bad Request on /api/v2/quality/evaluations/bulk for compliance export?

Compliance export fails Friday at 16:00 PT. External audit tool hits /api/v2/quality/evaluations/bulk and gets a 400 Bad Request. Payload shows “Form version mismatch”. I checked the Quality form version in admin and it matches the vendor setup. Management won’t stop yelling about the missing audit trail. Vendor insists the request body is fine. Agents score calls fine all day. Bulk endpoint just chokes. Org version 2024-02. Vendor SDK v3.1.2. The error log stops there.