[Asana HTTP Module] missing_project_template_date_variable error when sending valid JSON with requested_dates

How To
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Hi Make community,

I’m currently building a scenario that integrates HubSpot and Asana. The idea is to create a new project in Asana using a project template when a Deal in HubSpot is marked as approved (custom properties). I’m doing this using the HTTP module and the following Asana endpoint:

POST https://app.asana.com/api/1.0/project_templates/{template_gid}/instantiateProject

The template in Asana uses relative due dates (e.g., “3 days after project start”), so I understand that the API requires the requested_dates object with a project_start_date.

Here’s the raw JSON I’m sending in the Request Content field of the HTTP module:

{
  "data": {
    "name": "Project from HubSpot",
    "team": "1204050191559311",
    "requested_dates": {
      "project_start_date": "2025-06-15"
    }
  }
}

I’ve set the headers to include:

Authorization: Bearer my_token
Content-Type: application/json

But Asana returns this error:

{
  "errors": [
    {
      "error": "missing_project_template_date_variable",
      "message": "One or more date variables are missing in `requested_dates` field."
    }
  ]
}

What I’ve already tried:

  • Validated that project_start_date is required by the template
  • Used formatDate(closedate; "YYYY-MM-DD") inside Make to ensure the date is clean
  • Ensured no variables are wrapped inside quotes manually
  • Tried escaping the entire JSON using replace functions
  • Confirmed that the team and template GIDs are correct

My questions:

  1. Is there any known issue when sending requested_dates via the HTTP module in Make?
  2. Could this be due to how Make serializes the payload?
  3. Should I use Make an API call instead of the raw HTTP module?
  4. Has anyone successfully created an Asana project from a template that required project_start_date using Make?
  5. Any working example or workaround using an aggregator / JSON builder module?

Any help or ideas would be greatly appreciated. Thank you so much!