how to fix UTC Date: 2025-12-10T19:29:36.432Z Client Id: 51E97485A026480B8C0762407A2E62D3 Session Id: b9b15a58-3569-4773-ac22-789effb94de0 Client Version: 20251128003.09 BootResult: configuration Back Filled Errors: Unhandled Rejection: Error: 500:undefin

The error message you're encountering indicates a server-side issue, specifically a 500 error, which usually means there is a problem with the server processing your request. Here are some steps you can take to troubleshoot and potentially resolve the issue:

1. Check Service Status: Verify if there are any ongoing issues with Microsoft 365 services by checking the Microsoft 365 service health status page.
2. Clear Browser Cache: Sometimes, cached data can cause issues. Clear your browser's cache and cookies, then try signing in again.
3. Try a Different Browser or Device: Attempt to sign in using a different web browser or device to see if the issue persists.
4. Disable Extensions: If you're using browser extensions, particularly ad blockers or privacy tools, try disabling them as they may interfere with the sign-in process.
5. Check Network Connection: Ensure your internet connection is stable. A poor connection can lead to issues when trying to authenticate.
6. Contact Support: If the problem continues, consider reaching out to Microsoft support for further assistance, as they can provide more detailed insights into the specific error you're facing.

If you have access to the admin portal, you might also want to check the logs for any additional details related to the error.

Hello GracieEberhart, thanks for posting this in our community.

Please clear cached credentials. On Windows, open Credential Manager and remove any stored credentials for login.microsoftonline.com or your email domain. On Mac, use Keychain Access and delete related Microsoft account entries.

If your email is a personal account, kindly log in via OWA at https://outlook.office.com. If this is a work or school account, the admin should check if the account is provisioned with an Exchange Online mailbox or lacks the correct license assignment.

Kind regards,

John Oli