Do you have a problem with Facebook Lead Ad and GoToWebinar (400 Error)? – Here's the fix!

  • 17 April 2020
  • 1 reply

Userlevel 1


We have used a lot of Zaps that pull leads from Facebook Lead Ad to new registrants in GoToWebinar. 

Yesterday when we was creating a new Zap it stopped with this error “400 Error: Request contains invalid parameters. See validationErrorCodes for specific errors."

Now we have solved the problem and here's the solution:

  1. GoToWebinar has changed its field validation and Facebook Lead Ad dummy lead doesn't pass the validation anymore. Maybe because of the underlines and/or colons in firstname and lastname. 
  2. Example of Facebook dummy lead: test lead: dummy data for first_name | test lead: dummy data for last_name |
  3. How to fix it: Delete the dummy lead and create a new test lead from Facebook's "Preview Form" option ( You can use your own details with a new test lead.
  4. When the custom lead is ready, find that data in your Zap: Facebook Lead Ad ("Find Data" phase) and use the same custom lead for GoToWebinar phase ("Send Data")
  5. Another solution is to use “SKIP TEST” option, but I think this one is more reliable because you can be sure that the new lead has moved successfully to GoToWebinar.

Now it works and hope this helps others too!

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1 reply

Userlevel 7
Badge +12

Thanks a lot for sharing this solution, John!