Show original Article forces User to Login in Zendesk again

Hello Community, 

we have been trying for a couple of days now to get the non-legacy Zendesk Help Center working satisfactorily, but sadly we can't manage to disable the requiredZendesk login so that, when our users want to view an article in fullscreen mode ( show original article), they can do so without an extra Zendesk sign-in. 

Pendo support has sent me several articles, but all these settings have already been done and there is still the sign-in forced. 

https://support.zendesk.com/hc/en-us/articles/4408843923610-Using-restricted-help-center-content-with-Web-Widget-Classic-#topic_wj4_kpz_pw

Does anyone have an idea/solution or has had the same problem and already solved it? 

I am grateful for any tips!
Sherry