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Microsoft Teams Call Queue Voicemail Sync Issue Resolved wiht Shared Mailbox Solution
A frustrating synchronization problem impacting Microsoft Teams call queues has been identified and resolved,preventing duplicate customer callbacks and internal confusion. The issue stemmed from voicemail notifications appearing as individual emails within a Microsoft 365 group, failing to update read status across all users, and has been successfully addressed by transitioning to a shared mailbox setup.
Did you know? – voicemail notifications in Microsoft Teams call queues previously caused synchronization issues. When one team member marked a voicemail as read, the status didn’t update for others. This led to duplicate callbacks and internal confusion.
The problem, initially reported on November 7, 2025, centered around a team utilizing Teams for a call queue. According to the initial report, phone calls were successfully routed to all five team members, and voicemails were delivered as email notifications within their M365 group in Outlook. While this system allowed all users to access voicemail audio files, a critical flaw emerged: when one member marked a voicemail as read, the status did not synchronize for the remaining four users.
“This is creating duplicate calls back to customers at different times in the day creating a bit of frustration on the customer part and confusion internally,” one user explained.
Pro tip: – When troubleshooting Teams call queue voicemail sync issues, consider shared mailboxes. They allow read status synchronization across all users. This avoids duplicate callbacks and improves team efficiency. Ensure the shared mailbox remains under 50GB to avoid licensing costs.
Initial troubleshooting involved creating a Teams & MS 365 group, but this did not resolve the synchronization issue. One expert suggested investigating whether the users were members of a distribution list or a shared mailbox, noting that “shared mailboxes show the message read but DL’s come to each individual’s main mailbox and do not update.” Another user confirmed this, stating, “only a shared mailbox will update the message status for anyone with access. Otherwise they each get their own copy.”
The core of the problem lay in the mailbox configuration. The original setup utilized a single user M365 account, which exhibited the same synchronization issues. Subsequent attempts to leverage Teams and M365 groups ultimately functioned as distribution lists, perpetuating the problem.
Reader question: – How can I fix voicemail read status synchronization in my Teams call queue? The solution involves converting the existing account to a shared mailbox. This ensures all users access a common mailbox, allowing read and delete statuses to synchronize correctly.
A key constraint was the lack of an E3 license for the call queue account, which only possessed a Teams Phone resource license. This initially raised concerns about the cost of upgrading to an E3 license to enable a full user mailbox. Though, a crucial detail emerged: shared mailboxes do not require a license provided that they remain under 50GB in size.
“Shared Mailboxes don’t consume a license as long as they don’t go over 50G so you don’t need to worry about assigning one to it,” one commenter pointed out. “And, I would hope that converting it wouldn’t affect the Teams calling aspect of it… hopefully.”
The recommended solution, and ultimately the successful one, involved converting the existing account to a shared mailbox and granting appropriate access to team members. This configuration ensures that all users access a common mailbox,allowing read and delete statuses to synchronize correctly.
“If you still have the original user account, you can convert it to a shared mailbox and then give the appropriate people access to it,” an expert advised. “When you ‘subscribe’ users to a Team or 365 Group mailbox,it still acts like a distro and not a common mailbox.”
The user who initially reported the issue confirmed the success of the shared mailbox approach. “You are right! I forgot about the under 50gb threshold. Looks
