Hello @Scott Simmons,
Thank you for posting your query on Microsoft Q&A.
Based on the error message you provided, it appears your issue aligns with the recent DNS outage. A critical DNS misconfiguration in Microsoft Entra ID disrupted authentication services globally for nearly 90 minutes on February 25, 2025, impacting organizations using Seamless Single Sign-On (SSO) and Microsoft Entra Connect Sync.
The outage was caused by an IPv6 infrastructure cleanup operation that inadvertently removed essential CNAME records for the autologon.microsoftazuread.sso.com domain, leading to cascading failures in Kerberos ticket validation.
By 17:40 UTC, our engineers identified the faulty DNS change and began rollback procedures. Full recovery was achieved by 18:35 UTC after reverting the configuration, though some Entra Connect Sync deployments experienced residual synchronization delays.
For more details on this outage, you can refer to the following blog post:
Microsoft DNS Change Disrupts Entra ID Authentication – What You Need to Know
Please let me know if you are still encountering this error.
I hope this information is helpful. Please feel free to reach out if you have any further questions.
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