Fix Microsoft Planner Comment Delivery Failure Error 550 5.7.708
Question details
Users are experiencing delivery failure messages with error 550 5.7.708 when adding comments to Microsoft Planner tasks, causing the comments to not appear on task cards.
- Product
- Microsoft Planner / Microsoft 365
- Device & OS
- not provided
- Scenario
- Attempting to add comments to Microsoft Planner tasks directly or through Power Automate workflows.
- Observed behavior
- Comments fail to post on task cards, and the user receives a delivery failure notification containing error code 550 5.7.708. This issue typically occurs across all plans and tasks.
Verify that your standard Outlook email is functioning normally and confirm whether this issue affects only specific Planner tasks or all plans across your organization.
Escalate to Microsoft 365 Support via Admin Center
Because error 550 5.7.708 often indicates a backend or tenant-level block, your Microsoft 365 Administrator needs to investigate service logs with Microsoft Support.
This specific delivery failure is typically a service-side issue that cannot be fixed by adjusting local settings. Changes to automatic forwarding or outbound anti-spam settings will not resolve this problem.
Contact your organization's Microsoft 365 global administrator or IT department.
Have the administrator sign in to the Microsoft 365 Admin Center using their administrative credentials.
Navigate to the 'Support' section and select 'New service request'. Provide details about the Planner comment delivery failure and mention error code 550 5.7.708.
Ask the Microsoft support engineers to review the service logs in the background to identify and remove any hidden tenant blocks causing the delivery failure.
Review Power Automate Flow History
If you are using Power Automate to automate Planner tasks, isolating the exact failure step can provide helpful context for Microsoft Support.
Keep Your Team Productive with WPS Office
While waiting for Microsoft 365 support to resolve backend Planner delivery errors, you can maintain your team's productivity using WPS Office. As a free, lightweight, and highly compatible alternative, WPS Office provides everything you need to manage project reports, track tasks in spreadsheets, and collaborate seamlessly.
- 1. Download WPS Office: Visit the official WPS Office website and download the free installation package for your operating system.
- 2. Install the Software: Run the installer and follow the on-screen instructions to set up the lightweight office suite on your device.
- 3. Open and Edit Microsoft Formats: Launch WPS Office and directly open your existing .docx, .xlsx, or .pptx files to continue working without compatibility issues.
Frequently Asked Questions
What does error 550 5.7.708 mean in Microsoft 365?
Error 550 5.7.708 usually indicates that the tenant has been blocked from sending emails due to suspicious activity, trial limits, or internal server access denials. Because Microsoft Planner comments are routed via Exchange Online, this block prevents comments from being successfully posted.
Will changing outbound anti-spam settings fix the Planner comment error?
No, adjusting automatic forwarding or outbound anti-spam settings typically does not resolve this specific Planner comment delivery failure. It generally requires a backend investigation by Microsoft support.
Why do Microsoft Planner comments rely on email delivery?
Microsoft Planner is integrated with Microsoft 365 Groups. When you add a comment to a Planner task, the system uses Exchange Online to send that comment as an email message to the associated Group's mailbox, which is why email delivery failures affect task comments.
Can I fix this issue without contacting an administrator?
Unfortunately, no. Error 550 5.7.708 is a tenant-level issue. Only a user with global administrator privileges can access the Microsoft 365 Admin Center to open the necessary support ticket and request service log analysis.
