问题
Our Outlook add-in runs successfully for our production clients except for one specific tenant.
With this one tenant, the Office API call to getUserIdentityTokenAsync() returns a null token.
Here is what I have determined from reviewing our logs:
When they access the addin from the Mac Outlook client, getUserIdentityTokenAsync() returns "Status" = "failed" with error code "9017".
When they access the addin from Chrome or Firefox, getUserIdentityTokenAsync() returns "Status" = "succeeded" but the token value is null.
Their self-hosted Microsoft Exchange server version is 15.1.1531.3 and I have confirmed Exchange Web Services is enabled.
Does anyone have insight as to why this method is failing to return a token?
来源：https://stackoverflow.com/questions/53305330/office-api-call-to-getuseridentitytokenasync-returns-a-null-token