Zendesk Sell oAuth Authorization error when not currently logged in
It seems that the oAuth endpoints work fine when you are already logged into Zendesk Sell.
When you are not yet signed in with the browser, you are prompted a Login page, where you choose between a login form for old accounts or a button for new accounts (which I find weird that the new accounts since 2020 are not the default way to sign in).
When you choose to login with a new account and you complete the login then you are redirected to an error page:
An error occurred, The authorization server does not support this response type.
This error seems to happen because the “response_type" parameter is dropped in one of your redirects from the classic login to the new login.
I recorded a video that shows also the URLs in the address bar to showcase this behavior.
I think this needs a fix from Zendesk Sell's end, but if you have any ideas, let me know.
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This is due to your Zendesk trial expiring. The authentication still functions as anticipated as we keep that stored for a time in case you purchase the product. However when the redirect happens it tries to access the Zendesk account which is when the error occurs. The integration doesn't utilize the same pattern as the frontend UI so you're not experiencing this issue. I'll pass this along to the Sell team to look into.