Zendesk Client integration login issue

[Dmitrypuffin]

Hello,

I am working on 3CX integration with Zendesk. We are using client-side integration, since it is more convenient for our agents to have tickets automatically updated after phone call.
We have 2 Zendesk instances - Sandbox and Production.
I have prepared integration according to tutorial on both instances:

https://www.3cx.com/user-manual/zendesk-crm-integration/ - document no longer exists

Problem is following:
When I am trying to log in in Production environment, I receive following error:

When I am logging in Sandbox environment using add-in, it works:


Zendesk support told me that problem is related to 3CX add-in, not instance.
OAuth authorization is configured correctly, account credentials are correct.

How to fix this login problem? Please help me.

 

[edossantos]

The Zendesk plugin uses the grant_type "password" to authenticate. Please check this:
https://developer.zendesk.com/rest_api/docs/chat/auth#password-grant-type

 

[Dmitrypuffin]

Hello,

Solution was simple.
Our company is using SSO, but OAuth uses Zendesk's internal passwords. If users don't have such passwords, authorization will fail with 'invalid_grant' error.
After creating internal Zendesk password (for example, by resetting password), and using it for login, I have logged in successfully.

Maybe it will help someone

 

[edossantos]

Thanks for sharing!

 

[Mike Cartwright]

Thanks for the info, Dmitry. Also stumbled upon this: https://www.3cx.com/community/threa...side-also-difference-and-functionality.54694/

So it might help others with the same issue in the future. Cheers!