Users are experiencing Authentication failures while using Workspot Windows Client.

Microsoft has confirmed that the issue is caused by recent Windows updates — specifically KB5065789, KB5066835, and KB5066131 — which interfere with the HTTP.sys component used in server-side applications. This affects environments running Windows Server 2025 and Windows 11, and disrupts the authentication flow used by the Workspot Windows Client.

Resolution Steps (as per Microsoft):
Microsoft recommends the following actions to mitigate the issue:
- Step 1: On the affected machine, go to Settings > Windows Update and click “Check for updates.”
- Step 2: Restart the machine, regardless of whether new updates are found. This reboot helps restore normal functionality.

For air-gapped environments, Microsoft has provided a manual rollback installer:
Download Known Issue Rollback MSI https://download.microsoft.com/download/16d61dc0-7e94-4cd2-ba3c-4f59dece8488/Windows 11 24H2, Windows 11 25H2 and Windows Server 2025 KB5066835 251015_22001 Known Issue Rollback.msi

Next Steps:
We recommend IT administrators:
- Review devices for the presence of the affected KB updates.
- Apply the Microsoft-recommended mitigation steps.
- Use the Web Client as a temporary workaround if needed.

We will continue to monitor the situation and provide updates as necessary. Thank you for your patience and cooperation.

Issue Summary :
A subset of users attempting to log in to the Workspot Windows Client are experiencing authentication failures after entering the MFA verification code.

Root Cause :
The issue has been traced to the installation of the Preview Patch KB5065789 or the October 2025 Windows Cumulative Update. This update appears to interfere with the authentication flow used by the Workspot Windows Client.

Workaround :
>>Option 1: To restore normal login functionality, affected users should uninstall KB5065789 and the October 2025 Cumulative update from their local Windows device and perform a system reboot. This action has been confirmed to resolve the issue in multiple cases.

>>Option 2: As an alternative, users can access Workspot resources using the Web Client, which remains fully functional and unaffected by this issue.

Next Steps :
We recommend IT administrators review devices for the presence of KB5065789 and coordinate its removal where login issues are reported.

These workarounds will allow users to log in and continue working until we provide a permanent resolution.

Thank you for your patience and understanding. We truly appreciate your cooperation.