When you set "Live Event Permissions" to "People and Groups" and grant permissions to a specific group, the reasons why group members cannot access the live event may include:
- Group membership is not updated: Make sure that the identities of all group members have been correctly synchronized to Microsoft 365.
- Cache problem: Try to clear the Teams client cache and then log in to Teams again, or you can use the browser privacy mode to log in to Teams.
- Permission setting error: Confirm that you have added the group correctly and the email addresses of group members are correct.
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