I am posting this issue after searching through all the threads of form submissions.
My scenario is, Our HubSpot form is hidden on the page and We are showing a custom form to the users. Users fill the custom form and we then put all the user submitted values to hidden HubSpot form and submit the form via the trigger. It was working perfectly until a couple of months ago but things got changed at HubSpot end and We are stuck
Error appear on trigger is https://d.pr/uRoV6v