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Question

"Access token was issued with client id and secret from another app" error when connecting to ServiceTitan

  • January 17, 2026
  • 1 reply
  • 7 views

Can somebody please help me connect my Zapier to my Service Titan?

I have developer access to service Titan so I have created this app. I am also copying and pasting the tenant ID, client ID and client secret and selecting production so I have no idea why it’s appearing like it’s linking to a different app. I’m using copy and paste. I have set the restrictions inside of Service Titan into no restriction. I have tried deleting the app from the developer area from the Service Titan, deleted existing API connections in ST and clearing out my cache and trying it again and again even from a different device to make sure that it’s not saving something somewhere.
 

Has anyone else experienced this problem? I have no idea why I can’t make this simple connection. I’m literally copying and pasting so it can’t be wrong.

 

 

1 reply

Troy Tessalone
Zapier Orchestrator & Solution Partner
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  • Zapier Orchestrator & Solution Partner
  • January 19, 2026

Hi ​@MLem3223 

Help links for using ServiceTitan in Zaps: 

https://zapier.com/apps/servicetitan/integrations#help

https://help.servicetitan.com/how-to/zapier

https://help.servicetitan.com/faq/servicetitan-zapier-integration-faq

 

Prerequisites

To use the ServiceTitan app on Zapier, you must have: