HubSpot has several limits for custom behavioral events, including a limit on the number of event properties per event. Each event can contain data for up to 50 properties. If this limit is exceeded, the request will fail. See[HubSpot documentation](https://knowledge.hubspot.com/analytics-tools/create-custom-behavioral-events#define-the-api-call){:target="_blank"} for other limits.

`403` errors indicate that Segmentwas unable to send your event to HubSpot because the account connected doesn't have sufficient permissions. If you areobserving403sfor Custom Behavioral Events,pleaseensure that your HubSpot account is a`HubSpot Enterprise Marketing Hub` account. After upgrading your account to`Enterprise Marketing Hub`,please**Reauthorize** from the`Settings` page of your destination to resolve`403` errors.

`403` errors indicate that Segmentis unable to send your event to HubSpot because the account connected doesn't have sufficient permissions. If you'reobserving`403` errorsfor Custom Behavioral Events, ensure that your HubSpot account is a`HubSpot Enterprise Marketing Hub` account. After upgrading your account to`Enterprise Marketing Hub`,**Reauthorize** from the**Settings** page of your destination to resolve the`403` errors.