ERR_LOOKUP_RELATIONSHIP on HubSpot: Lookup relationship error. Root cause: A Salesforce Lookup Relationship field is referencing a record that does not exist or is not accessible to the current user. This occurs when the related record has been deleted, when the user lacks read access to the related object, or when the lookup field is pointing to a record in a different Salesforce org. Step 1: Verify target exists. Check target record Step 2: Check relationship. Verify relationship valid Step 3: Update reference. Point to valid record Step 4: Test relationship. Verify link works