HubSpot Starts Enforcing Your Admin Rules on Every API Write on September 8 — Here’s What Breaks
On September 8, 2026, HubSpot ships its 2026-09 API version, and with it a genuine breaking change: admin-configured validation rules will be enforced on all CRM API write paths. Conditional required properties, required fields on the Create Record form, and user-level association permissions &mdash





