HubSpot · api · fg-0390

HubSpot rejects a dropdown value with 'Property values were not valid'

400 Property values were not valid

Verified 2026-10-15 · Confirmed by 0 builders · Trust 50/100

Cause

Enumeration properties such as dropdowns, radio selects, and checkboxes accept only the internal option value, which often differs from the label people see. Labels, wrong case, or yes and no for booleans are rejected.

Fix

Read the property definition and map labels to option values before writing, or add the missing option to the property.

Apply

GET /crm/v3/properties/contacts/{propertyName}  // use options[].value, not options[].label

Affects: HubSpot CRM v3 object and batch endpoints, all tiers, as of 2026-10

Sources

Have your agent know this before it fails

claude mcp add --transport http footgun https://getfootgun.com/api/mcp