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This guide covers the most common Microsoft 365 integration issues.

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Peach does not appear in Enterprise Applications

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Symptoms

  • Peach is not visible in Microsoft Entra
  • Users cannot be assigned

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Resolution

Verify that the Admin Consent URL was completed using a Microsoft Entra administrator account. Refresh the Enterprise Applications page after consent is granted.
You should see Peach listed as an Enterprise Application.

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Users cannot sign in

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Symptoms

  • Login fails after Microsoft authentication
  • User receives an access error

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Resolution

Verify the user has been assigned to the Peach Enterprise Application. Navigate to: 
Microsoft Entra → Enterprise Applications → Peach → Users and Groups
Confirm the user or security group is listed.

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Shared mailbox does not appear

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Symptoms

  • User completes onboarding
  • Expected mailbox is missing

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Resolution

Verify the user has access to the mailbox within Microsoft 365. Peach can only display mailboxes that Microsoft has granted the user permission to access.
Mailbox permissions are managed within Microsoft Exchange and Microsoft 365.

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Emails are not appearing in Peach

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Symptoms

  • Mailbox connects successfully
  • New emails do not appear

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Resolution

Verify:
  • The mailbox connection completed successfully
  • The mailbox still exists
  • Microsoft permissions have not been revoked
You can disconnect and reconnect the mailbox from Peach Settings.

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Outbound emails fail to send

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Symptoms

  • Email sends successfully in Peach
  • Recipient never receives the message
  • Microsoft generates a Non-Delivery Report (NDR)

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Resolution

Many Microsoft tenants apply stricter filtering to application-generated mail. Your Microsoft administrator may need to create an Application Access Policy. Example: 
New-ApplicationAccessPolicy `
-AppId 45c38646-07a4-4998-b43c-58e1b5c0bcee `
-PolicyScopeGroupId <your shared mailbox> `
-AccessRight RestrictAccess `
-Description "Scope Peach Mail.Send to shared mailboxes only"
This configuration varies by institution and may require assistance from your Microsoft administrator.

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Test outbound email delivery

Peach includes a built-in email delivery test. Navigate to: 
Settings → Email Integration
Select Test Outbound for the connected mailbox. Send a test message to your email address.
Screenshot 2026 06 15 At 2 20 25 PM
Receiving the test email confirms that Microsoft is allowing outbound mail from Peach.

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Still need help?

If the issue persists, gather the following information before contacting support:
  • Institution name
  • Shared mailbox address
  • User email address
  • Screenshot of the error
  • Any Microsoft NDR message
Providing this information will help us resolve the issue more quickly.