Difference between a Participant and a Reviewer

Hi Team,

We have created a Talent Review Template and a meeting, while creating the meeting we have selected a Reviewer and a Participant. The issue we are facing is that the Participant is unable to find the Talent Review meeting at all, the navigation My Team--> Talent Review doesn't have any data. And the Reviewer is having the meeting under the navigation My Team-->Talent Review but unable to conduct the meeting or move Employees within the grid/boxes. Is this is the expected behavior? What is the difference between Participant and a Reviewer and what are their roles in a Talent Review