Calendar Problems

Fix Power Automate Not Sending Calendar Invites to External Users

Maira Mehtab Sep 21, 2026 869 views

Question details

A Power Automate workflow using 'Forward an Email V2' successfully adds external email addresses to a calendar invite, but fails to deliver the notification emails to non-Microsoft accounts.

Product: Power Automate
Device & OS: not provided
Scenario: Automating the forwarding of a calendar invitation to external users after a specific form is completed.
Observed behavior: Microsoft accounts receive the calendar invitation successfully, but non-Microsoft external recipients do not receive any notification.

Before you start

Verify that the external email addresses entered in the form are completely valid and formatted correctly before diagnosing organizational policy restrictions.

Solution 1Recommended

Check Microsoft 365 External Sharing Policies

Organizational policies in Microsoft 365 often block automated emails and calendar invites to external domains by default.

Many organizations restrict external sharing to prevent data leakage. If a workflow attempts to forward calendar events outside the tenant, Exchange may silently drop the message for non-Microsoft domains.

Contact your Administrator

Reach out to your organization's Microsoft 365 or IT administrator to review current sharing rules.

Review Exchange Admin Center

Ask the administrator to check the Exchange Admin Center for Mail Flow rules or External Sharing policies that restrict calendar invitations to external domains.

Whitelist Domains

If permissible, have the administrator whitelist the required external domains or adjust the policy to allow automated forwarding.

Solution 2

Monitor for Bounce-Back (NDR) Messages

Check for hidden delivery failures to understand exactly why the external notification was blocked.

Solution 3

Use Manual Forwarding or ICS Attachments as a Workaround

Bypass forwarding restrictions by modifying the workflow delivery method or manually sending the invites.

Free Microsoft Office alternative

Need a Reliable and Free Office Suite?

While automated email workflows and Exchange policies are managed via Microsoft systems, WPS Office provides a lightweight, highly compatible alternative for your daily document, spreadsheet, and presentation needs without complex IT restrictions.

1. Download WPS Office: Visit the official WPS website and download the free installation package.
2. Install and Launch: Run the installer and open WPS Office on your device.
3. Open Office Files Easily: Drag and drop your existing Microsoft Office files into WPS to continue working seamlessly.

Fully compatible with Microsoft Office formats like DOCX, XLSX, and PPTX.Free to use with a familiar, intuitive interface for seamless migration.Lightweight installation ensures fast and smooth performance on any device.Integrated PDF tools allow for easy document sharing and editing.

microsoft office alternative - wps office

Frequently Asked Questions

Why do external recipients not receive automated calendar invites?

Exchange admin policies often block automated email forwarding to external domains by default to prevent data leaks. This causes flows that forward invites to fail silently for non-Microsoft domains.

How can I check if a bounce-back message was generated?

Open the Outlook inbox of the account used to authenticate the 'Forward an Email V2' connector in Power Automate. Check both the Inbox and Junk Email folders for Undeliverable messages.

Can I send calendar invites as attachments instead?

Yes. You can modify your Power Automate flow to use the 'Send an email (V2)' connector and attach the exported .ics calendar file, which is less likely to be blocked by forwarding restrictions.

Outlook & Email Problems