How do I fix the credential prompt error in Outlook 365?

To fix this issue, remove the EnableRememberPwd registry entry by following these steps:

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Exit Outlook.
Start Registry Editor.
In Registry Editor, locate and then click one of the following subkeys in the registry:
Locate and select the following value:
On the Edit menu, click Delete.
Click Yes to confirm the deletion.

How do I fix the username and password pop up in Outlook?

Open the “File” menu, click the “Account Settings” button, and then select “Account Settings.” Select your email account, and then click “Change” to open the settings to change the account’s password.

How do I enable modern authentication in Outlook?

In the Microsoft 365 admin center, go to Settings > Org Settings > Modern Authentication. In the Modern authentication flyout that appears, click to enable or disable Turn on modern authentication for Outlook 2013 for Windows and later (recommended).

Why is Outlook suddenly asking for a password?

Cause. This issue can occur if the Logon network security setting on the Security tab of the Microsoft Exchange dialog box is set to a value other than Anonymous Authentication.

How do I force Outlook to authenticate?

To enable modern authentication in Exchange Online, follow these steps:

Sign in to Microsoft 365 admin center.
Expand Settings and click on Org settings.
Click on Services in the top bar.
Choose Modern authentication from the list.
Check the box Turn modern authentication for Outlook 2013 for Windows and later (recommended)

Why Outlook is asking for password again and again?

If Outlook keeps asking for your password, you either typed it incorrectly or you have an unstable Internet connection. You can also reset the login settings for your Outlook and start all over again. A missing update for your e-mail client can also cause this problem so make sure it’s up to date.

How do I change my authentication in Outlook?

Change how you do additional verification

Sign in to Microsoft 365 using your password and second verification method.
Click here to see the Additional security verification page.
Choose how you want to do your second verification.
When complete, click Save.

Why is my Outlook email not authenticated?

An “Authentication Failed” error means the email server cannot verify that your email access is authorized. This is typically due to a mistyped password, but it can also be caused by an incorrect username, connecting to the wrong server, or blacklisting.