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Citrix published application requesting credentials to send email via mapi


I have a published application "ABC" in Citrix Xenapp 6.5. The  location specified in the application properties is another server. This application has recently had a functionality added where it can send email out to customers. But the users are being prompted for credentials by outlook as shown in image named "Outlook_Security_Prompt.JPG" attached to this question.

We have Office 365 in Hybrid mode and Outlook 2013 on the citrix server.
If my understanding is correct then this app is launching the Outlook 2013 from the Citrix server to send this email.
As the user is already logged on to citrix and has app "ABC" open from this server then shouldn't pass through authentication work and user should not be prompted for the username and password?
 is it because of the issue mentioned in the article below:-
OR something related to OAuth?

How can I determine the root cause?


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Do the users also get the authentication prompt when they open their Outlook 2013 manually/normally?

Do the users run their regular Outlook 2013 client from the same Citrix server as where the "ABC" application is hosted?

It would seem to me that the "ABC" application is opening Outlook 2013 on different servers than where the users regularly open their Outlook 2013, and so it either has the wrong config or it is asking from authentication, as it's the first time it is being opened on that Citrix server.





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