A few months ago I successfully configured the Dynamics 365 App for Outlook. It worked correctly in all environments until yesterday. Application Versions: CRM: 8.2.5.4 (on-prem) AD FS: 3.0 (Server 2012 R2) Outlook 2016 (16.0.4843.1000) Exchange is on-prem as well. Beginning yesterday, when users try to access Dynamics 365 within the Outlook client, they are prompted for credentials, via the AD FS form prompt, however the window does not dismiss after a successful credential challenge. The "We're reviewing you Dynamics 365 information..." spinner continues to spin in the reading pane, but will ultimately time out with the message: "We're unable to connect to your Microsoft Dynamics 365 server. Please try closing and reopening the app. Activity ID: 206de4cd-a0dd-d860-b1fd-1777c8ed66c4 Date: Wed, 10 Jul 2019 18:27:23 GMT Error: [MailApp] Client loader timed out Trace: Error at ClientError ( company.mydomain.com/.../shim.js at Anonymous function ..." I cannot find any errors, in trace logs, or Event Viewers on the local machine or server that correlate to the reported Activity ID. While this is now impacting all users in my company when using the full Outlook client, we can access the App via Outlook Web Access (OWA). The credential prompt comes up, and dismisses correctly, and the expected functionality to Track and Set Regarding is provided without error. I have found many discussions from 2017 and 2018 describing similar issues. None of their solutions have been able to help. I have cleared my IE cache at least a dozen times. Removed the App and reinstalled it. Restarted our CRM server. Disabled and Re-enabled IFD & Claims Auth. Disabled and Enabled ClaimsSettings and OAuthClaimsSettings as well. Verified the Dynamics 365 App for Outlook AdfsClient RedirectUri. Any ideas and assistance would be greatly appreciated.
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