Participians added in meeting from "Sprints" disappered in Meetings

Participians added in meeting from "Sprints" disappered in Meetings

We have zoho one subscription. 

In "Sprints" module I created sheduled Metting and added participiances from my team (all have Zoho one licences in same subscription). 

Same meeting appeared in "Meetings" module BUT participians list was empty. There are no attached users. 

As a result they don't see this meeting in their "Meetings" dashboards. 

Is it an bug or a feature :) ?
and do I need to add them twice, first in "Sprints" and then in "Meetings" for same meeting?

Regards,
Ghenadii