Hi @dev71
Welcome to the Auth0 Community!
Based on the use-case that you detailed, I believe the issue could lie within the logout URL itself, as it seems to lead to a successful logout, but not a correct redirection. One main point is to provide the client_id in the URL so that the redirection is made to the correct application screen and also, that the logout URL configured both on Zoho and Auth0’s end match.
As an example, if you want to redirect users after they log out to the https://www.example.com website, your encoded logout URL ( that contains the client_id ) should look like this : https://{yourDomain}/v2/logout?returnTo=https%3A%2F%2Fwww.example.com&client_id={yourClient_ID}. The non-encoded https://www.example.com should be added within the Allowed Logout URLs list of the Applications settings in your Auth0 Dashboard.
I highly recommend reading through the following documentations and topics for more details on how to accomplish this:
Hope this helped!
Gerald