Our team is trying to update the Install Date field for contacts and have had success in updating them when there is currently an install date in HubSpot, but when there is not an install date in HubSpot for the contact it does not update with the new date.
Is it not possible to use the batch update to update contacts that do not currently have an install date?
Hey, @cetl 
Welcome to the community! When posting questions, it’s always helpful to share an example of your request, request body (when used), the response, and error messages returned (if applicable).
Additional questions to help the community:
- Is Install Date a custom property on the Contacts object?
- If so, what property-type is the property? For example, date or dateTime?
Thank you for the additional information. — Jaycee