Unable to update owner__c field for contact in HubSpot

Developer Support APIs & Integrations
1

Hi Team,
I am unable to update owner__c field for contact in HubSpot using HubSpot API

API URL: {{baseUrl}}/crm/v3/objects/contacts/237381156454

Please see error message below

Request
{

“properties”: {

"brand": "",

"owner__c": "rama.singh@apexit.com",

"company": "",

"contract_expire_date__c": "",

"description": "",

"email": "test_rama2@gm.com",

"explain_other_ls__c": "ewogICJFeHBsYWluT3RoZXJMU19jIiA6ICJld29nSUNKRmVIQnNZV2x1VDNSb1pYSk1VMTlqSWlBNklDSWlDbjA9Igp9",

"industry": "",

"firstname": "test rama2",

"loss_detail__c": "",

"loss_reason__c": "",

"menu_type__c": "",

"method_of_contact__c": "",

"lastname": "24july",

"leadsource": "Call-In",

"mobilephone": "",

"number_of_locations_total__c": "",

"number_of_locations_in_pipeline__c": "",

"opening_date__c": "",

"purchased_list__c": "",

"uco_estimated_pounds__c": "",

"franchise_name__c": "",

"hs_analytics_source": "",

"opening_date_text__c": "",

"referrer_s_job_title__c": "",

"referrer_s_name__c": "",

"corporate_or_franchise__c": "Franchise"

}

}

Response:
{

"status": "error",

"message": "Property values were not valid: \[{\\"isValid\\":false,\\"message\\":\\"rama.singh@apexit.com was not one of the allowed options: \[true, false\]\\",\\"error\\":\\"INVALID_OPTION\\",\\"name\\":\\"owner__c\\"}\]",

"correlationId": "019f94ed-a207-7f86-8f30-349b122f5469",

"errors": \[

    {

        "message": "rama.singh@apexit.com was not one of the allowed options: \[true, false\]",

        "code": "INVALID_OPTION",

        "context": {

            "propertyName": \[

                "owner__c"

            \]

        }

    }

\],

"category": "VALIDATION_ERROR"

}

2

The field that stands out is owner__c. I’d check the property definition before spending more time on the PATCH call itself:

GET /crm/v3/properties/contacts/owner__c

Look at modificationMetadata.readOnlyValue, the field type, and whether that property is managed by Salesforce or another sync. The PATCH /crm/v3/objects/contacts/{id} shape is fine for writable contact properties, but HubSpot will reject a value update when the property is read-only/calculated/integration-managed.

If you mean the native HubSpot contact owner, use hubspot_owner_id instead and send the HubSpot owner ID, not the email string. If owner__c is a synced/custom source field, I’d update it in the source system or map into a separate writable HubSpot property.

Disclosure: drafted with AI assistance.