'Outlook add-in not visible in outlook Calendar

I have created a custom add-in and I am able to add/get it in the outlook mail but it is not visible in my outlook calendar. Also, I am trying to add it by clicking on the calendar event->more options->get add-ins but seems like the button is not clickable as nothing is fetched.



Solution 1:[1]

Make sure that you specified correct rules in the manifest file:

 <Rule xsi:type="RuleCollection" Mode="Or">
    <Rule xsi:type="ItemIs" ItemType="Message" FormType="Edit" />
    <Rule xsi:type="ItemIs" ItemType="Appointment" FormType="Edit" />
    <Rule xsi:type="ItemIs" ItemType="Message" FormType="Read" />
    <Rule xsi:type="ItemIs" ItemType="Appointment" FormType="Read" />
  </Rule>

Plus in the manifest file for the ribbon UI you need to specify different extension points for messages and appointments. The manifest contemplates these:

<!-- Message compose form -->
<ExtensionPoint xsi:type="MessageComposeCommandSurface">
<!-- Appointment compose form -->
<ExtensionPoint xsi:type="AppointmentOrganizerCommandSurface">
<!-- Message read form -->
<ExtensionPoint xsi:type="MessageReadCommandSurface">
<!-- Appointment read form -->
<ExtensionPoint xsi:type="AppointmentAttendeeCommandSurface">

You can find the full sample add-in source code at https://github.com/OfficeDev/outlook-add-in-command-demo .

Solution 2:[2]

Currently, we do not support add-ins in Outlook To Do. We track Outlook add-in feature requests on our?Tech Community Page. Please submit your request there and choose the appropriate label(s). Feature requests on Tech Community are considered, when we go through our planning process.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 João Pimentel Ferreira
Solution 2 Outlook Add-ins Team - MSFT