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When attempting to use the Dynamics 365 App for Outlook, you receive the following message:
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When you try to use the Dynamics 365 App for Outlook, you receive the following error message:
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> "We're unable to connect to your Microsoft Dynamics 365 server. Please try closing and reopening the app."
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> We're unable to connect to your Microsoft Dynamics 365 server. Please try closing and reopening the app.
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## Cause
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## Cause 1: An issue is cached by your web browser
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This error can occur for one of the following reasons:
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### Resolution
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**Cause 1:** An issue is cached by your web browser.
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If you're using Outlook desktop, Outlook uses Internet Explorer to display the web pages. For more information about how to clear the Internet Explorer history and cache, see [View and delete your browsing history in Internet Explorer](https://support.microsoft.com//topic/view-and-delete-your-browsing-history-in-internet-explorer-098ffe52-5ac9-a449-c296-c735c32c8678).
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**Cause 2:** Your Dynamics 365 security role is missing one or more required privileges.
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**Cause 3:** The Dynamics 365 App for Outlook doesn't receive a response when requesting a page from the Dynamics 365 server.
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> [!IMPORTANT]
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> If this error appears to be resolved after clearing your web browser cache but eventually returns, see [Error "We're unable to connect to your Microsoft Dynamics 365 server" when using Dynamics 365 App for Outlook](we-are-unable-to-connect-to-your-dynamics-365-app-for-outlook-error.md) for a potential solution.
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## Resolution
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## Cause 2: Your Dynamics 365 security role is missing one or more required privileges
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**Resolution 1:** Clear your web browser cache.
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### Resolution
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If you're using Outlook Desktop, Outlook uses Internet Explorer to display the web pages. For more information about how to clear the Internet Explorer history and cache, see [View and delete your browsing history in Internet Explorer](https://support.microsoft.com//topic/view-and-delete-your-browsing-history-in-internet-explorer-098ffe52-5ac9-a449-c296-c735c32c8678).
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Verify your Dynamics 365 security role includes all of the required privileges in [Required privileges for Dynamics 365 App for Outlook](previous-versions/dynamicscrm-2016/administering-dynamics-365/dn946901(v=crm.8)#required-privileges).
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> [!IMPORTANT]
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> If this error appears to be resolved after clearing your web browser cache but eventually returns, see [Error "We're unable to connect to your Microsoft Dynamics 365 server" when using Dynamics 365 App for Outlook](https://support.microsoft.com/help/4341413) for a potential solution.
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## Cause 3: The Dynamics 365 App for Outlook doesn't receive a response when requesting a page from the Dynamics 365 server
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**Resolution 2:** Verify your Dynamics 365 security role includes all of the required privileges in [Required privileges for Dynamics 365 App for Outlook](/previous-versions/dynamicscrm-2016/administering-dynamics-365/dn946901(v=crm.8)).
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### Resolution
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**Resolution 3:**Check to see if your Dynamics 365 (online) organization isn't available or something is blocking communication with Dynamics 365 (online). Verify you can access your Dynamics 365 organization via your web browser. If you can't access your Dynamics 365 organization via your web browser, the Dynamics 365 App for Outlook can't access your organization either. If you're unable to access your Dynamics 365 organization with your web browser, contact your Dynamics 365 administrator.
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Check to see if your Dynamics 365 organization isn't available or something is blocking communication with Dynamics 365. Verify you can access your Dynamics 365 organization via your web browser. If you can't access your Dynamics 365 organization via your web browser, the Dynamics 365 App for Outlook can't access your organization either. If you're unable to access your Dynamics 365 organization with your web browser, contact your Dynamics 365 administrator.
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## More information
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For more information about URLs required to access Dynamics 365 (online), see [Troubleshooting: Unblock URLs required for Dynamics 365 (online)](/previous-versions/dynamicscrm-2016/administering-dynamics-365/dn762335(v=crm.8)).
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For more information about URLs required to access Dynamics 365, see [Troubleshooting: Unblock URLs required for Dynamics 365 (online)](/previous-versions/dynamicscrm-2016/administering-dynamics-365/dn762335(v=crm.8)).
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