Access to the Conversation tab to guest users in a SharePoint site

[AtanasM]

Guest users of a SharePoint site cannot open the "Conversation" tab to check the emails of the group mailbox.
Error message: "Read group email in your inbox. As a guest member of this group, you don't have access to the group mailbox. You can read messages to and from the group in your inbox."
How can I allow access to the group mailbox direct in the SharePoint site?

[#2 · Accepted solution]

Hello, guest users doesn't have direct access to the corresponding group mailbox but they can participate in group conversations from their own mailbox.