Hi all,

I’m attempting to retrieve line items associated with a deal using a Custom Code Action in a HubSpot Workflow. I’m using a Private App with full CRM read access. Authentication works, and I can fetch general deal information, but I’m consistently unable to retrieve associated line items—even though they’re clearly visible in the HubSpot UI.

What is working:

• I can retrieve deal information using /crm/v3/objects/deals/dealId.

• Authentication via Private App works with Bearer token.

• Deal records are new and contain line items added through the “Add Product” button.

What is not working:

1. GET /crm/v3/objects/deals/dealId/line_items
   Returns: results:

2. GET /crm/v4/objects/deals/dealId/associations/line_items/deal_to_line_item
   Returns: 405 Method Not Allowed

3. GET /crm/v4/objects/deals/{dealId}/associations/line_items
   Returns: 404 Not Found

4. Checked for associated quotes using /crm/v4/objects/deals/{dealId}/associations/quotes – no quotes found.

5. Tried adding archived=false in requests. No difference.

6. Removed all property filters to rule out filtering as a cause.

Goal:
I simply need to access the names (or product values) of the line items associated with a deal using a supported method within a workflow-based custom code action. So far, no combination of endpoints is returning the expected line item data, and I would appreciate a working approach or confirmation if there are known limitations here.

If you need more context:

• The portal uses a private app with full object scopes

• Deals are created recently

• Line items are added from the product library

• No quotes are involved

Thanks in advance for any guidance.