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Fix Missing Accept Button in Outlook Web Calendar Sharing Invitation
Question details
Users are unable to accept shared calendars because the Accept button is completely missing when viewing the invitation in a web browser.
- Product
- Microsoft Exchange / Outlook on the web
- Device & OS
- not provided
- Scenario
- A recipient receives a calendar sharing invitation and attempts to open and accept it using Outlook on the web.
- Observed behavior
- The interactive Accept button does not appear in the email. This typically occurs when a server-side disclaimer transport rule modifies the calendar message using the Wrap fallback action.
You must have Exchange Administrator privileges to resolve this issue. Standard users cannot modify mail flow rules and should share these steps with their IT department.
Change the Disclaimer Transport Rule Fallback Action
Modify the Exchange transport rule to prevent calendar messages from being altered by the disclaimer Wrap fallback action.
When an Exchange transport rule is configured to append a disclaimer and uses 'Wrap' as a fallback action, it encapsulates the original message in a new envelope. This modification strips the interactive 'Accept' button from calendar sharing invitations in Outlook on the web. Changing the fallback action to 'Ignore' prevents this corruption.
Log in to the Exchange Admin Center (EAC) using your administrator credentials.
In the left-hand navigation pane, go to the 'Mail flow' section and click on 'rules'.
Locate and select the transport rule that appends the disclaimer to emails, then click the edit icon to modify its properties.
Scroll down to find the 'Fallback action' setting. Change the selection from 'Wrap' to 'Ignore'.
Click 'Save' to apply the changes. Newly sent calendar sharing invitations will now properly display the Accept button in web browsers.
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Frequently Asked Questions
Can a standard user fix the missing Accept button issue in Outlook Web?
No, standard users cannot resolve this issue themselves. The missing button is caused by a server-side mail flow rule that only an Exchange Administrator or IT professional can access and modify.
Why does the 'Wrap' fallback action break calendar invitations?
The 'Wrap' action creates a completely new email message envelope to apply the disclaimer. This encapsulation process strips or hides the interactive calendar metadata required to display the 'Accept' button in Outlook on the web.
What happens when the fallback action is set to 'Ignore'?
When set to 'Ignore', the Exchange transport rule simply skips appending the disclaimer if it cannot be safely applied. This leaves the original calendar sharing invitation and its interactive buttons fully intact.
