The error sent from Salesforce isn't clear or known. These types of suspensions are rare and often resolve themselves, but if the error persists after you click Clear Suspension, contact HubSpot support.
Salesforce Object Permissions Missing
The two most common causes of this error is that the integration user doesn't have the HubSpot Integration Permission set(in theAvailable Permission Setssection, selectHubSpot Integration Permissions) in Salesforce, or one of the objects attempting to sync doesn't have the correct permissions in Salesforce.
If the user has Read and Edit permissions, it is a cross-related object. Ensure that the integration user has ReadandEdit permissions on any related (such as by lookup) objects. The objects typically required by the integration are:
Salesforce Field Permissions Missing
The integration user doesn't have Read and Edit permissions for a field on the syncing object, or a field on an object related by lookup.
Salesforce Organization Locked
A temporary error caused when an operation is occurring that must be completed before another update can occur. For example, another integration is making an update to an object that is simultaneously being updated by HubSpot. If the error persists after you click Clear Suspension, contact your Salesforce system administrator to unlock the organization.
The API call use displayed in the Salesforce sync screen is a sliding window/rolling 24 hour period. The API limit applies to the most recent 24 hours period.
Missing Field Mappings
There are no mappings between HubSpot properties and Salesforce fields. If the error persists after you click Clear Suspension, or there are are no standard field mappings in your integration settings, contact HubSpot support.