License & Subscription Issues

How to Stop Microsoft Bookings from Emailing Unlicensed Staff Accounts

Emma Brown Sep 28, 2026 869 views

Question details

Users are receiving undeliverable notifications from Microsoft Bookings sent to staff accounts that do not have active mailboxes, despite notifications being disabled.

Stop Microsoft Bookings from Emailing Unlicensed Staff Accounts

Product: Microsoft Bookings
Device & OS: not provided
Scenario: Setting up desk-booking or using placeholder users without an Exchange mailbox.
Observed behavior: Microsoft Bookings continues to send automated emails to unlicensed accounts, resulting in bounce-back or undeliverable error messages.

Before you start

Ensure you have access to the Microsoft 365 admin center to verify user licenses, Exchange mailboxes, and resource mailbox configurations.

Solution 1Recommended

Configure Desk Resources and Check Notifications

Adjusting how placeholder accounts are set up and verifying notification toggles can resolve the undeliverable email issue.

Using unlicensed user accounts as placeholders often triggers automated routing attempts by Bookings. Converting these to actual resources or fully disabling staff alerts is the most effective approach.

Disable staff-level notifications

Navigate to your Bookings calendar, select the Staff tab, edit the specific placeholder staff member, and ensure 'Notify the staff member via email when a booking assigned to them is created or changed' is unchecked.

Use Resource Mailboxes

Instead of using unlicensed user accounts for desk-booking, go to the Exchange admin center and create them as Equipment or Workspace resource mailboxes.

Configure Desk Resources and Check Notifications

System Behavior Delay: Changes to Microsoft 365 mailboxes and Bookings settings may take a few hours to propagate fully across the system.

Solution 2

Consult the Microsoft Bookings Tech Community

Since this is a known routing quirk with the Microsoft Bookings backend, escalating to Microsoft engineers may be required for complex tenants.

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Frequently Asked Questions

Why do unlicensed staff accounts get undeliverable emails in Microsoft Bookings?

When an account lacks an Exchange mailbox but is added as staff, automated booking confirmations sent to their address bounce back as undeliverable because there is no inbox to receive them.

Can I use room or equipment resources instead of staff accounts for desk booking?

Yes, it is highly recommended to set up desks as Resource Mailboxes (Equipment or Workspace) in the Exchange Admin Center rather than as unlicensed user accounts to avoid routing errors.

How do I disable staff email notifications in Microsoft Bookings?

Go to your Bookings calendar, select Staff from the left menu, edit the specific staff member profile, and uncheck the option to notify the staff member via email when a booking is created or changed.

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