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Copy file name to clipboardExpand all lines: support/power-platform/dataverse/d365-app-outlook/the-authentication-was-not-successful.md
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title: The authentication wasn't successful error
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description: Solves the authentication error that occurs when you try to use the Dynamics 365 App for Outlook in the Outlook desktop client.
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ms.reviewer:
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ms.date: 02/27/2025
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ms.date: 03/06/2025
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ms.custom: sap:Dynamics 365 App for Outlook Add-In
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---
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# "Sorry, the authentication was not successful" error occurs in Dynamics 365 App for Outlook
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This article outlines several potential causes for the authentication error that occurs when you use the Dynamics 365 App for Outlook in the Outlook desktop client, and provides corresponding resolutions.
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This article outlines several potential causes of the authentication error that occurs when you use the Dynamics 365 App for Outlook in the Outlook desktop client, and provides corresponding resolutions.
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_Applies to:_ Dynamics 365 App for Outlook
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_Original KB number:_ 4483111
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> Error: QuotaExceededError
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This indicates that your local browser storage limit has been exceeded.
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The error indicates that your local browser storage is exceeded.
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### Resolution
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@@ -60,14 +60,14 @@ To solve this issue, clear your browser cache.
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After clearing your browser cache, close all Internet Explorer and Outlook desktop windows, and ensure there are no remaining Internet Explorer processes running by checking Task Manager.
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If this issue persists only in the Outlook desktop client and clearing the cache via Internet Options doesn't help, try clearing it via the F12 IEchooser (not applicable for Windows 7):
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If this issue only exits in the Outlook desktop client and clearing the cache via Internet Options doesn't help, try clearing it via the F12 IEchooser (not applicable for Windows 7):
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1. Open the Dynamics 365 App for Outlook in the Outlook desktop client.
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2. Open the **IEChooser.exe** located in `%WindowsFolder%\System32\F12` (for example, `C:\Windows\System32\F12`).
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3. In the **Choose target to debug** window, select **Dynamics 365**.
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4. Select the **Network** tab and then select the **Clear cache** button.
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After completing the steps above, reopen Outlook and the Dynamics 365 App for Outlook to see if the issue is resolved.
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After completing these steps, reopen Outlook and the Dynamics 365 App for Outlook to see if the issue is resolved.
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