Integrating Lindy with HubSpot: Need Help with Contact Associations

Hey all! I wonder if anyone has any experience integrating Lindy with Hubspot? I've tried several times now to try and get Lindy to first check if a contact exists based on a Gmail received trigger, and if not, create the contact. This bit works fine. Then, I want it to generate a task associated with the contact. My problem is that it doesn't appear to be associated the generated task with the contact, then when I ask lindybuilder to ensure the association is correct, it gets stuck in a loop and then I subsequently get the 'agent not found' error. Any advice would be appreciated!