At the moment, SSO implementation using OfficeRuntime.Auth.getAccessToken() is supporting only for OWA, Desktop and macOs. We are facing lot of issues when Addins are supported for mobile platforms a...
I agree, we are told by Microsoft to switch using Outlook REST over to graph before November 2022. The Microsoft code samples push us to use SSO with IdentityAPI 1.3, but it turns out that this API is not supported on ios or Android, which is a big setback.