问题
I have created an Outlook add-in, which uses mailbox.getCallbackTokenAsync() function to authenticate with EWS API. For the majority of the add-in users, this works without issues.
However, for some users, calling this function results in the "An internal error has occurred" error. This seems to occur just once, and subsequent calls to this function return token successfully.
Users that experience issues use various Outlook versions - Outlook 16.0.6965.2115, Outlook 16.0.7571.2109, Outlook Mac 15.29, ...
Do you have any idea what is the cause of this error?
来源：https://stackoverflow.com/questions/41855014/getcallbacktokenasync-returns-an-internal-error-has-occurred