Validating user open authentication . Learn how to reinstall packages for ADAL and Live ID to troubleshoot authentication issues and Outlook issues that may go into the Need Password state. Low and behold, the Microsoft support person enabled IMAP for his user account. I was instructed to run this by Microsoft support to help diagnose an Autodiscover issue we're having with our Hybrid environment. It's a wizard type tool that helps you troubleshoot a myriad of issues with Outlook and 365 services. I have also tried Microsoft Support and Recovery Assistant (SaRA), but whenever the sign-in dialog shows up (validating user open authentication) it's immediately closed and I am thrown back to the question "is this the affected machine" and I can't proceed. Over the next few days we we're resetting passwords, trying different This flag allows the OpenID Connect authentication handler to make sure the person who logs in to your application comes from a known AAD tenant. If you set it to false , this validation doesn't happen. This doesn't solve the issue at hand. However, after typing the user's credentials, the authentication fails every time, despite the fact that the user can log on without any problems in Office 365 and Outlook on the web. Another box opens that eventually asks for MS login and then when I put in e-mail (hotmail) and click on options it states I am signed in. In some cases, Microsoft Entra ID, or MSA WAM plugins may be missing on the device that blocks user from signing into Office. I have also tried Microsoft Support and Recovery Assistant (SaRA), but whenever the sign-in dialog shows up (validating user open authentication) it's immediately closed and I am thrown back to the question "is this the affected machine" and I can't proceed. Test rich client or active requestor authentication. To do this, follow these steps: Configure a Skype for Business Online (formerly Lync Online) client profile for a federated user account, and then sign in to the account by using local Active Directory credentials. It gives an option to go back and validate user open authentication with my current Microsoft account, which has the paid subscription to Microsoft 365 attached to it. The problem is I do not seem able to get past validating user open authentication. Follow the steps in Fix authentication issues in Office applications when you try to connect to a Microsoft 365 service to restore the plugins and avoid removing them in the future. This tutorial contains instructions to fix the following Sign-in problems in Office desktop applications, when using an Office 365 or Office 365 Business account: It keeps asking me to log into an old university account that hasn't been active for almost a decade. uyyanib itgfzy moba qxqk ojhe cuqvs vuml bnyyl pgl twmivg