Unfortunately, the 400 error doesn’t tell us much about what is the issue.
If you have the Make DevTool Chrome extension installed, you should be able to view the request and response headers and body from each module when you manually run the scenario.
Make DevTool allows you to debug your Make scenarios in a completely new way. It adds an extra pane to the Chrome Developer Tools. Using this new debugger pane, you’re able to check all the manual runs of your scenario, review all the performed operations and see the details of every API call performed. It also brings a whole bunch of new opportunities for Apps development. You’re able to check every call that your app has performed. Thanks to this extension, you can easily debug your scenario, see which module, operation, even which single response causes the error, and then get your scenario back on track. Try it out and let your scenarios shine!