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"The service Backend for React API - List Calls [BE] [DATA] just returned an error (HTTP 400)" error when testing synthflow phone call complete

  • July 16, 2025
  • 5 replies
  • 15 views

When testing the trigger “Phone call completed” with Synthflow, I keep getting this error message:

Unable to pull phone calls

Please reload the page. If the issue persists, troubleshoot error or contact Support.

Error code: Error while retrieving: The app returned "The service Backend for React API - List Calls [BE] [DATA] just returned an error (HTTP 400). Please consult their documentation to ensure your call is setup properly. Raw error:". {"statusCode":400,"message":"The service Backend for React API - List Calls [INTERNAL USE] [ACTION] just returned an error (HTTP 422). Please consult their documentation to ensure your call is setup properly. Raw error:\n\n{"status":"error","error":"BaseError","message":"Input should be less than 100","response":{"answer":"Input should be less than 100","call_id":""}}","args":{"bubble_code":"1752645803511x457929688782354940"}}

 

My app, trigger event, account (API Key), and model ID are all inputted.

 

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5 replies

MohSwellam
Zapier Orchestrator & Solution Partner
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  • Zapier Orchestrator & Solution Partner
  • 902 replies
  • July 16, 2025

Hi ​@cperkinson 

 

Seems you need to contact Synthflow because you need to setup your account in a way to enable the calls to be retrieved.


  • Author
  • New
  • 2 replies
  • July 16, 2025

I have the API key inputted, that doesn’t suffice?


MohSwellam
Zapier Orchestrator & Solution Partner
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  • Zapier Orchestrator & Solution Partner
  • 902 replies
  • July 16, 2025

If you can provide a screenshot of this Trigger in Edit mode that would be best, I need to see if there is any fields you are missing maybe. 


  • Author
  • New
  • 2 replies
  • July 16, 2025

Attached


MohSwellam
Zapier Orchestrator & Solution Partner
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  • Zapier Orchestrator & Solution Partner
  • 902 replies
  • July 22, 2025

When the app asks you for the Model ID, are you sure its the correct ID? You might wanna check that on SynthFlow side