manifest.xml

<?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>dac64749-60d7-4579-9036-cb7308b6d444</Id>
  <Version>1.0.0.0</Version>
  <ProviderName>Contoso</ProviderName>
  <DefaultLocale>en-US</DefaultLocale>
  <DisplayName DefaultValue="Outlook add-in SSO in events sample"/>
  <Description DefaultValue="Use SSO to access Microsoft Graph from code using event-based activation in an Outlook add-in."/>
  <IconUrl DefaultValue="https://localhost:3000/assets/icon-64.png"/>
  <HighResolutionIconUrl DefaultValue="https://localhost:3000/assets/icon-128.png"/>
  <SupportUrl DefaultValue="https://www.contoso.com/help"/>
  <AppDomains>
    <AppDomain>https://localhost:3000</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://localhost:3000/taskpane/taskpane.html"/>
        <RequestedHeight>250</RequestedHeight>
      </DesktopSettings>
    </Form>
  </FormSettings>
  <Permissions>ReadWriteMailbox</Permissions>
  <Rule xsi:type="RuleCollection" Mode="Or">
    <Rule xsi:type="ItemIs" ItemType="Message" FormType="Read"/>
    <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="1.12">
          <bt:Set Name="Mailbox"/>
        </bt:Sets>
      </Requirements>
      <Hosts>
        <Host xsi:type="MailHost">
          <!-- Specifies the event-based activation runtime. -->
          <!-- For more information, see https://learn.microsoft.com/office/dev/add-ins/outlook/autolaunch. -->
          <Runtimes>
            <!-- HTML file that references the JavaScript event handlers. This is used by Outlook on the web. -->
            <Runtime resid="WebViewRuntime.Url">
              <!-- JavaScript file that contains the event handlers. This is used by Outlook on Windows. -->
              <Override type="javascript" resid="JSRuntime.Url"/>
            </Runtime>
          </Runtimes>
          <DesktopFormFactor>
            <ExtensionPoint xsi:type="MessageComposeCommandSurface">
              <OfficeTab id="TabDefault">
                <Group id="CategoriesGroupMessageCompose">
                  <Label resid="CategoriesGroupLabel"/>
                  <Control xsi:type="Button" id="MessageComposeSelectButton">
                    <Label resid="SelectButtonLabel"/>
                    <Supertip>
                      <Title resid="SelectButtonLabel"/>
                      <Description resid="SelectButtonDescription"/>
                    </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="AppointmentOrganizerCommandSurface">
              <OfficeTab id="TabDefault">
                <Group id="CategoriesGroupAppointmentOrganizer">
                  <Label resid="CategoriesGroupLabel"/>
                  <Control xsi:type="Button" id="AppointmentOrganizerSelectButton">
                    <Label resid="SelectButtonLabel"/>
                    <Supertip>
                      <Title resid="SelectButtonLabel"/>
                      <Description resid="SelectButtonDescription"/>
                    </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>
            <!-- Enables the add-in on specified events. -->
            <ExtensionPoint xsi:type="LaunchEvent">
              <LaunchEvents>
                <LaunchEvent Type="OnNewMessageCompose" FunctionName="onMessageComposeHandler"/>
              </LaunchEvents>
              <!-- Identifies the runtime to be used by the add-in (also referenced by the Runtime element). -->
              <SourceLocation resid="WebViewRuntime.Url"/>
            </ExtensionPoint>

          </DesktopFormFactor>
        </Host>
      </Hosts>

      <Resources>
        <bt:Images>
          <bt:Image id="Icon.16x16" DefaultValue="https://localhost:3000/assets/icon-16.png"/>
          <bt:Image id="Icon.32x32" DefaultValue="https://localhost:3000/assets/icon-32.png"/>
          <bt:Image id="Icon.80x80" DefaultValue="https://localhost:3000/assets/icon-80.png"/>
        </bt:Images>
        <bt:Urls>
          <bt:Url id="JSRuntime.Url" DefaultValue="https://localhost:3000/commands/commands.js"/>
          <bt:Url id="WebViewRuntime.Url" DefaultValue="https://localhost:3000/commands/commands.html"/>
          <bt:Url id="Taskpane.Url" DefaultValue="https://localhost:3000/taskpane/taskpane.html"/>
        </bt:Urls>
        <bt:ShortStrings>
          <bt:String id="CategoriesGroupLabel" DefaultValue="Outlook add-in SSO in events sample"/>
          <bt:String id="SelectButtonLabel" DefaultValue="Show task pane"/>
        </bt:ShortStrings>
        <bt:LongStrings>
          <bt:String id="SelectButtonDescription" DefaultValue="Opens the task pane for the Outlook add-in SSO in events sample."/>
        </bt:LongStrings>
      </Resources>

      <!-- Specifies SSO scopes and resources for the web application that hosts this add-in. -->
      <!-- For more information, see https://learn.microsoft.com/office/dev/add-ins/develop/sso-in-office-add-ins#configure-the-add-in. -->
      <WebApplicationInfo>
        <Id>Enter_client_ID_here</Id>
        <Resource>api://localhost:3000/Enter_client_ID_here</Resource>
        <Scopes>
          <Scope>openid</Scope>
          <Scope>user.read</Scope>          
          <Scope>profile</Scope>
        </Scopes>
      </WebApplicationInfo>
      <ExtendedPermissions>
        <ExtendedPermission>AppendOnSend</ExtendedPermission>
      </ExtendedPermissions>
    </VersionOverrides>
  </VersionOverrides>
</OfficeApp>