Search code examples
microsoft-graph-apisingle-sign-onoffice-jsoutlook-addinoutlook-web-addins

What is the best way to implement SSO-OBO flow for Outlook Mobile (IOS and Android)?

We have created an Outlook (GRAPH) addin that uses the SSO-OBO flow. It works perfectly with MAC-Outlook, Win-Outlook and Outlook Web Access.

However, when we opened the same addin in Outlook Mobile (IOS and Android), it kept on failing in the part where we were requesting for a token (Office.Auth.getAccessToken()). After some investigation, we found out that mobile Outlook does not support Identity API 1.3.

We would want our addin to work in Outlook Mobile using the SSO-OBO flow. Preferably, we would want to avoid popups or dialogs. But if that is inevitable then we go that way.

Here then are my questions :

  1. What is the best way to implement the SSO-OBO flow (bootstrap-exchange-to-GRAPH token) for mobile Outlook addins?

  2. Has anybody heard of a plan to support Identity API 1.3 for Mobile-Outlook? We have to consider that REST will be retired by November 2022.

I hope these questions made sense.

Thank you all in advance.

Solution

    1. It is up to you which solution to use. There is no such recommendations published.

    2. Have never heard about such short-term plans. You can find Office versions and platforms that support 1.3 in the Identity API requirement sets article.

    Note, you can file a new feature request or vote for the existing one at https://aka.ms/M365dev-suggestions .