In this article I’m going to highlight some of the scenarios that cause login issues and offer a few solutions and troubleshooting tips. In this comprehensive guide—KB113—we’ll explore the most common causes of Office 365 sign-in and activation issues. We’ll then walk you through a practical, step-by-step troubleshooting methodology.

A Guide To Troubleshooting Microsoft 365 Login Issues

It will analyze every function of your Office 365 environment and make the necessary changes to get things working again. A vast community of Microsoft Office365 users that are working together to support the product and others. This issue occurs if user authentication is interrupted after a Microsoft Tech fixes at FixTechGuide Entra authentication system error state is detected. The tool will ask you to enter the email address or mobile phone number you're trying to sign in with and check the details you provide.

Support Ticket

Which means that after you’ve enabled MFA, Outlook will start repeatedly prompting for credentials. Many IT people then created an app password for Outlook to use. Modern authentication is safer and won’t go corrupt on you as an app password might. Rich7359 & @scott-sa-spiceworks I had another user login and the does not exist with that user so I know the issue is profile related. I did see in credential that most of the Office 365 apps are using my password from about 5 weeks back, I corrected that and then opened Word then tried to login to it.

• Very often when we get a call that someone didn’t receive an email it’s actually because Outlook is offline and requesting a password.
• By following the guidance in this article, both end users and IT administrators can minimize downtime, ensure productivity, and maintain smooth access to the full suite of Office 365 applications.
• There’s quick repair, which I’ve never had success with and Online Repair, which I’ve always had success with.
• A good idea would be to delete profile or alternatively to create a new user profile and try to login to O365 account.
• Those days are long gone but if you were an early adopter of Microsoft/Office 365 then Outlook might not be enabled for modern authentication.
• @scott-sa-spiceworks okay, I "edited" the passwords for Office to my current one in that credential box but it did not help.

One thought on "Troubleshoot 365 logon issues"

One of the options was to save a diagnostic file for MS support. We have our subscription through Rackspace and I’ll see if they can help later this afternoon as that is who MS referred me to when I sought support help from them. I saw in the MS knowledgebase where there was a certain update that was part of the issue but that was quite some time ago and MS has since issued patches to fix it in relation to that update. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.

3 Step 3: Verify Network Connectivity and Firewall Settings

Find solutions to common problems or get help from a support agent. Once you are in the microsoft folder, delete the OneAuth and IdentityCache folders. You can also cut and paste them to a different location like your desktop. To do this, open Credential Manager from Control Panel by just typing the word Credential after hitting the Windows key. Notice everything that references Microsoft online, and all those "msteams" items, too. I think I’m going to try what I mentioned in my last post and see what happens.





Microsoft 365 is a vital tool for many businesses, and login issues can significantly disrupt day-to-day operations. In this guide, we will take an in-depth look at troubleshooting and resolving common Microsoft 365 login problems so you can keep your business running smoothly. If you’ve tried all these steps and still can’t resolve the sign-in or activation errors, you may need more advanced troubleshooting.