Error code received for Webinar Update and not for Webinar Create

Hello,

We have an integration with Zoom that uses Server-to-Server OAuth for communicating with Zoom. When we make an api call to create the webinar, it is successful. But when we try to update the same webinar, Zoom returns the following error :

{

    "code": 4711,

    "message": "Invalid access token, does not contain scopes:[webinar:update:webinar, webinar:update:webinar:admin]."

}

The authorization token created has the following scopes:

 "scope": "meeting:write:meeting:admin meeting:read:meeting:admin meeting:write:registrant:admin meeting:write:batch_registrants:admin webinar:write:webinar:admin webinar:read:webinar:admin webinar:write:registrant:admin"

When we asked the client to add the webinar:update scope, we were told that option no longer exists in zoom. Could you please help resolve this issue? Thanks!