title: Can I get graph access token from exchange user identity token in outlook add-in?
body: <p>According to documentation at <a href="https://docs.microsoft.com/en-us/office/dev/add-ins/outlook/authentication#exchange-user-identity-token" rel="nofollow noreferrer">Exchange user Identity token</a>, I can use user identity token <code>as a fallback authentication (and authorization to Microsoft Graph) when the add-in is running on a version of Office that doesn't support SSO.</code></p>
  <p>But I did not get any way to use this id token in context of firing graph APIs. Am I missing something here?</p>
  <p>I am working on a outlook addin, which doesn't support SSO in browsers where third-party cookie access is blocked. Is there any way for fetching graph access token from exchange id token or callback tokens?</p>
  <p>I want to avoid using popup for authentication as this is creating unnecessary friction in user flow in Safari and Chrome incognito.</p>