how can I activate the ZMeeting<->ZNotebook integration?

how can I activate the ZMeeting<->ZNotebook integration?

I just read about the ZMeeting<->ZNotebook integration on
https://www.zoho.com/blog/meeting/zoho-notebook.html?utm_source=newsletter-june-2021&utm_medium=email&utm_campaign=met-newsletter

Now when I run a ZMeeting, the "notes" button does not appear.
I am a paying Zoho One customer in EU DC area.
How can I activate this feature?

best
Oliver