Adding a OIDC app in Zoho One
Sign in to Zoho One, then click icon on the top-right corner.
Go to Applications, then click Add Application.
Click Add SSO App.
Name the app, and enter a description if needed.
Select OIDC under SSO Mode.
Select the type of application you're adding under Application Type.
Enter Sign-in URL, Sign-out URL and Callback URL of the relying Party in the respective fields.
Click Done, then click Create.
To assign this application to users, click Assign Users; to setup SSO to users, click Configure; and complete the configuration by verifying.
Adding Zoho One's URLs in the third-party app
Open the added OIDC app and click Single Sign-on.
Copy the Client ID, Client Secret, Authorization Endpoint, Token Endpoint, and User Info Endpoint.
In the third-party's OIDC Configuration Page, paste the copied values into the respective fields.
Testing the OIDC configuration
Assign yourself as a user for the OIDC app added in Zoho One. Now try signing in to the third-party app using OIDC SSO.