Zoho Desk API - Error: Unsupported content type: text/html;charset=utf-8 at callback URL

[msergievskiy]

I am working on ZOHO Desk automation and need to get the ZOHO auth token for n8n

I created the app in ZOHO Desk API, got client id and client secret. Added all data required to get a token in n8n.

After I sign in with my ZOHO credentials in ZOHO oauth2 login window and accepting the grant operation, I get the page with the address n8n - OAuth Callback (and long list of parameters) and text

“Error: Unsupported content type: text/html;charset=utf-8
More details
Failed to connect. The window can be closed now.”

I tried to construct the token request URL and use it in browser, and I got the text

“Something went wrong. Please try again!”

Not too verbose, and looks like that Zoho is to blame for returning plain text instead of JSON with token. However, when I follow the same workflow in Postman, I can get the token properly.
I suppose the issue is with callback URL I use, but n8n forces me to use
https://oauth.n8n.cloud/oauth2/callback

What could be an issue? Thanks.
PS I use n8n cloud.

[interss]

Hi, welcome @msergievskiy

Could you share your workflow so we can see how we can help?

Thank you

[msergievskiy]

I do not see how to do that. Here is the link - I assume, it is only accessible by me - n8n.io - Workflow Automation

When I press Share, I see that my workflow is shared to my project, and the “Close” button, with no other options.

Anyway, there is nothing in the workflow - manual start and single HTTP request only, for which I fail to get the auth credentials.

[interss]

A link shared this way requires a user’s email and password to access it.

One way to share your link is to click this button when you are replying

This will appear

Then, go to your workflow, press CRTL + A
This will select your workflow.

Then press CRTL + C
This will copy your workflow

Then you go here to N8N’s reply and in the field as shown in the photo you delete the message and copy your code between the lines, pressing CRTL + V

This way we can see how to help you