Expected behavior

This valid manifest file taken by your example should be correctly validated by office-addin-manifest validate.

ItemSend event is valid inside VersionOverrides.

Current behavior

It’s throwing an error:

Error #2:
Mailbox add-in containing ItemSend event is invalid.: Mailbox add-in containing ItemSend event is invalid.
  - Details: Mailbox add-in manifest contains ItemSend event in VersionOverrides which is not allowed.

The manifest is not valid.

Steps to Reproduce

1. create this valid manifest file and name it manifest_dev.xml
2. run: npx office-addin-manifest validate manifest_test.xml
3. Invalid error: Mailbox add-in manifest contains ItemSend event in VersionOverrides which is not allowed.

Context

In the context of creating an ItemSend Event for an Outlook Appointment.

• Operating System: Windows 10
• Node version: v12.18.3
• Office version: 365
• Tool version: “office-addin-manifest”: “^1.7.8”

Failure Logs

We are using this manifest which also fails with Mailbox add-in manifest contains ItemSend event in VersionOverrides which is not allowed.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<OfficeApp xmlns="http://schemas.microsoft.com/office/appforoffice/1.1"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:bt="http://schemas.microsoft.com/office/officeappbasictypes/1.0"
  xmlns:mailappor="http://schemas.microsoft.com/office/mailappversionoverrides/1.0"
  xsi:type="MailApp">
  <Id>90992a37-6ac0-4e31-8f4d-c35d61ac033b</Id>
  <Version>1.0.0.0</Version>
  <ProviderName>CKT (dev)</ProviderName>
  <DefaultLocale>en-US</DefaultLocale>
  
  <DisplayName DefaultValue="Sync events with CKT Portal (dev)"/>
  
  <Description DefaultValue="Sync events of Outlook with CKT portal (dev)"/>
  
  <IconUrl DefaultValue="https://ckt-d.internal.epo.org/addins/outlook/ckt.gif"/>
  <HighResolutionIconUrl DefaultValue="https://ckt-d.internal.epo.org/addins/outlook/ckt-128x128.gif"/>
  <SupportUrl DefaultValue="https://ckt-d.internal.epo.org"/>

  <AppDomains>
    <AppDomain>https://ckt-d.internal.epo.org</AppDomain>
  </AppDomains>

  <Hosts>
    <Host Name="Mailbox"/>
  </Hosts>

  <Requirements>
    <Sets>
      <Set Name="Mailbox" MinVersion="1.1"/>
    </Sets>
  </Requirements>

  <FormSettings>
    <Form xsi:type="ItemRead">
      <DesktopSettings>
        <SourceLocation DefaultValue="https://ckt-d.internal.epo.org/addins/outlook/taskpane.html"/>
        <RequestedHeight>250</RequestedHeight>
      </DesktopSettings>
    </Form>
  </FormSettings>

  <Permissions>ReadWriteMailbox</Permissions>

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

  <DisableEntityHighlighting>false</DisableEntityHighlighting>

  <VersionOverrides xmlns="http://schemas.microsoft.com/office/mailappversionoverrides" xsi:type="VersionOverridesV1_0">
    <VersionOverrides xmlns="http://schemas.microsoft.com/office/mailappversionoverrides/1.1" xsi:type="VersionOverridesV1_1">

      <Requirements>
        <bt:Sets DefaultMinVersion="1.8">
          <bt:Set Name="Mailbox"/>
        </bt:Sets>
      </Requirements>

      <Hosts>
        <Host xsi:type="MailHost">
          <DesktopFormFactor>
            <FunctionFile resid="Taskpane.Url"/>
            <ExtensionPoint xsi:type="AppointmentOrganizerCommandSurface">
              <OfficeTab id="TabDefault">
                <Group id="apptComposeDemoGroup">
                  <Label resid="groupLabel" />
                  <!-- Task pane button -->
                  <Control xsi:type="Button" id="TaskpaneButton">
                    <Label resid="TaskpaneButton.Label" />
                    <Supertip>
                      <Title resid="TaskpaneButton.Label" />
                      <Description resid="TaskpaneButton.Tooltip" />
                    </Supertip>
                    <Icon>
                      <bt:Image size="16" resid="Icon.16x16" />
                      <bt:Image size="32" resid="Icon.32x32" />
                      <bt:Image size="80" resid="Icon.80x80" />
                    </Icon>
                    <Action xsi:type="ShowTaskpane">
                      <SourceLocation resid="Taskpane.Url" />
                    </Action>
                  </Control>
                </Group>
              </OfficeTab>
            </ExtensionPoint>
            <ExtensionPoint xsi:type="AppointmentAttendeeCommandSurface">
              <OfficeTab id="TabDefault">
                <Group id="apptReadDemoGroup">
                  <Label resid="groupLabel" />
                  <!-- Task pane button -->
                  <Control xsi:type="Button" id="TaskpaneButton2">
                    <Label resid="TaskpaneButton2.Label" />
                    <Supertip>
                      <Title resid="TaskpaneButton2.Label" />
                      <Description resid="TaskpaneButton2.Tooltip" />
                    </Supertip>
                    <Icon>
                      <bt:Image size="16" resid="Icon.16x16" />
                      <bt:Image size="32" resid="Icon.32x32" />
                      <bt:Image size="80" resid="Icon.80x80" />
                    </Icon>
                    <Action xsi:type="ShowTaskpane">
                      <SourceLocation resid="Taskpane.Url" />
                    </Action>
                  </Control>
                </Group>
              </OfficeTab>
            </ExtensionPoint>
            <ExtensionPoint xsi:type="Events">
              <Event Type="ItemSend" FunctionExecution="synchronous" FunctionName="validateSubjectAndCC" />
            </ExtensionPoint>
          </DesktopFormFactor>
        </Host>
      </Hosts>
    
      <Resources>
        <bt:Images>
          <bt:Image id="Icon.16x16" DefaultValue="https://ckt-d.internal.epo.org/addins/outlook/ckt.gif"/>
          <bt:Image id="Icon.32x32" DefaultValue="https://ckt-d.internal.epo.org/addins/outlook/ckt-32x32.gif"/>
          <bt:Image id="Icon.80x80" DefaultValue="https://ckt-d.internal.epo.org/addins/outlook/ckt-80x80.gif"/>
        </bt:Images>
        <bt:Urls>
          <bt:Url id="Taskpane.Url" DefaultValue="https://ckt-d.internal.epo.org/addins/outlook/taskpane.html"/>
        </bt:Urls>
        <bt:ShortStrings>
          <bt:String id="groupLabel" DefaultValue="CKT Add-in (dev)"/>
          <bt:String id="TaskpaneButton.Label" DefaultValue="CKT (dev)"/>
          <bt:String id="TaskpaneButton2.Label" DefaultValue="CKT (dev)"/>
        </bt:ShortStrings>
        <bt:LongStrings>
          <bt:String id="TaskpaneButton.Tooltip" DefaultValue="Sync Outllook events with CKT as Organizer (dev)"/>
          <bt:String id="TaskpaneButton2.Tooltip" DefaultValue="Sync Outllook events with CKT as Attendee (dev)"/>
        </bt:LongStrings>
      </Resources>

    </VersionOverrides>
  </VersionOverrides>
</OfficeApp>