Error received from test - Amazon Appflow

Amazon AppFlow received the following error:
The request failed because the service Source HubSpot returned the following error: Details: The request failed with status code 403 (Forbidden).This app hasn’t been granted all required scopes to make this call. Read more about required scopes here: Working with OAuth - HubSpot docs.. Status code 403 (Forbidden)..
Despite enabling all scopes on the Private App, I have been receiving this error

Hey, @MChowdary :waving_hand: The community may need more details before they can help. Can you tell us:

  • for auth, does App Flow use OAuth or a Private App?
  • what subscriptions does your portal have?
  • what is the exact endpoint you are making a request to?

Thanks for the additional details! — Jaycee