Fix

Author: v-phoebh

support/power-platform/dataverse/d365-app-outlook/dynamics-app-for-outlook-authentication-pop-up-blank-cannot-proceed.md

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 title: Dynamics 365 App for Outlook Authentication Pop-Up Is Blank
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 description: Solves the issue that the authentication pop-up is blank and you can't sign in to Dynamics 365 App for Outlook.
 ms.reviewer: mkelan
 ms.author: smurkute
 author: shwetamurkute
 ms.date: 02/20/2025
 ms.custom: sap:Dynamics 365 App for Outlook Add-In
 ---
+
 # App for Outlook authentication pop-up is blank and unable to sign in
 
 The article solves an issue where you can't sign in to Microsoft Dynamics 365 App for Outlook successfully due to a blank authentication pop-up.
 
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 ## Symptoms
 
 When you open [Dynamics 365 App for Outlook](/dynamics365/outlook-app/overview), it prompts you to allow an authentication pop-up. After you allow it, the pop-up opens. However, it's blank and prevents you from selecting an account to authenticate and sign in.
 
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 ## Cause
 
 This behavior is due to a recent regression that has been mitigated. However, users who have previously signed in might still experience this issue until they clear their session and sign in again.
 
 ## Resolution
-> - If you're using Outlook on the web (OWA) or the classic Outlook desktop app on Windows, follow steps 1 to 3 to solve the issue.
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 > [!NOTE]
 >
-> - If you're using Outlook on the web (OWA) or the classic Outlook desktop app on Windows, follow steps 1 to 3 to solve the issue.  
 
 > - If you're using [the new Outlook for Windows](https://support.microsoft.com/office/switch-to-new-outlook-for-windows-f5fb9e26-af7c-4976-9274-61c6428344e7) or Outlook on Mac, follow [these steps](#open-the-developer-tools-in-the-new-outlook-for-windows-and-outlook-on-mac) to open the Developer Tools, and then follow steps 1 to 3 to resolve the issue.
 
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 ### Step 1: Clear local storage and session storage from the add-in
 
-1. Open the classic Outlook desktop app or OWA.
 
-2. Open **Dynamics 365 App for Outlook**.
 
-3. Right-click anywhere inside the add-in and select **Inspect**. The **Developer Tools** window will open.
 
 4. Select the **Application** tab.
 5. Under **Storage**, select **Local Storage** and delete all stored data.
 6. Select **Session Storage** and delete all stored data.
 7. Close the **Developer Tools** window.
 
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 ### Step 2: Clear local storage and session storage from the authentication window
 
 
-1. Reopen **Dynamics 365 App for Outlook**.
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-2. If the authentication window appears, right-click inside it and select **Inspect**. The **Developer Tools** window will open.
 
-3. Select the **Application** tab.
 
-4. Under **Storage**, select **Local Storage** and delete all stored data.
 
-5. Select **Session Storage** and delete all stored data.
 
 6. Close the authentication window.
 
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 ### Step 3: Reopen the add-in and complete authorization
 
 
 
-1. Close and reopen Outlook.
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-2. Open **Dynamics 365 App for Outlook**.
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 3. If prompted, sign in with your credentials.
 4. Complete the authentication process.
 
 ### Open the Developer Tools in the new Outlook for Windows and Outlook on Mac
 
 
-- For the new Outlook for Windows:
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   1. Ensure Outlook is fully closed in Task Manager.
   2. Select <kbd>WIN</kbd>+<kbd>R</kbd>, and then run the `olk.exe –devtools` command to open Outlook with the Developer Tools.
 
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 - For Outlook on Mac:
 
-  To open the Developer Tools, see [Debug Office Add-ins on a Mac](/office/dev/add-ins/testing/debug-office-add-ins-on-ipad-and-mac#debugging-with-safari-web-inspector-on-a-mac).