Windows 10 Enterprise LTSC 2021 known issues
Microsoft lists no open issue for Windows 10 Enterprise LTSC 2021 right now. Below is every issue Microsoft has listed for this version, with the update that caused it and when it was resolved.
| Issue | Status | Caused by | Opened | Resolved or updated |
|---|---|---|---|---|
| USB audio devices might fail to start or produce no sound | Resolved KB5131096 | OS Build 19044.7725, KB5122878, 2026-09-08 | 10 November 2026 | 10 November 2026 |
| Remote Desktop Services might stop responding after Sept. 2026 security update | Resolved KB5129236 | OS Build 19044.7725, KB5122878, 2026-09-08 | 11 September 2026 | 14 September 2026 |
| Host folder shares might be unavailable in Hyper-V-based Linux VMs | Resolved KB5129236 | OS Build 19044.7725, KB5122878, 2026-09-08 | 11 September 2026 | 14 September 2026 |
| Incorrect notifications that "Microsoft Defender Antivirus is turned off" | Resolved | N/A | 28 August 2026 | 30 September 2026 |
| Windows Server Update Services sync operations might have issues or time out | Resolved | N/A | 18 July 2026 | 20 July 2026 |
| Deleting a file from the Recycle Bin displays an internal filename in the dialog | Resolved KB5099539 | OS Build 19044.7417, KB5094127, 2026-06-09 | 18 June 2026 | 14 July 2026 |
| Apps might become unresponsive when saving files to cloud-backed storage | Resolved KB5078129 | OS Build 19044.6809, KB5073724, 2026-01-13 | 21 January 2026 | 23 January 2026 |
| Some devices might fail to shut down or hibernate | Resolved | OS Build 19044.6809, KB5073724, 2026-01-13 | 16 January 2026 | 10 February 2026 |
| Connection and authentication failures in Azure Virtual Desktop and Windows 365 | Resolved KB5077796 | OS Build 19044.6809, KB5073724, 2026-01-13 | 14 January 2026 | 17 January 2026 |
| Message Queuing (MSMQ) might fail with the December 2025 Windows security update | Resolved KB5074976 | OS Build 19044.6691, KB5071546, 2025-12-09 | 13 December 2025 | 18 December 2025 |
| An incorrect "End of Support" message might appear in Windows Settings | Resolved KB5068781 | OS Build 19044.6456, KB5066791, 2025-10-14 | 3 November 2025 | 11 November 2025 |
Source: Microsoft's release health page for Windows 10 Enterprise LTSC 2021. Dates are in UTC.
Last updated