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One of the most common reasons the update won’t be applied to a set of Windows 10 devices is that the hardware does not meet minimum requirements for Windows 11. Windows Update for Business won’t offer the update to a device that doesn’t meet eligibility requirements. As to the reporting you can use, Windows Update for Business offers reporting for Feature Updates that should get you pointed in the right direction. The knowledge base article is here, Use the workbook for Windows Update for Business reports - Windows Update for Business reports | Microsoft Learn, and look specifically for the “Device status group for feature updates” which will include the Windows 11 readiness status to show devices that are capable, not capable or unknown for Win 11 readiness. If the devices not receiving the update are showing as capable, your next step is to see if the update attempted to apply but failed. You can find this documented here Use Windows Update for Business reports for Windows Updates in Microsoft Intune - Microsoft Intune | Microsoft Learn – so if the update attempted to apply (so the device received the offer) but failed, it should have a failure status in this report. One common failure is there is not adequate disk space on the device for the update to apply. If you end up in a scenario where your devices are capable, but nothing is showing in your error reports, confirm that you are still receiving monthly quality updates on those devices as well. If not, then you may have a communications error to the Windows Update for Business backend service, which are the ports documented within our troubleshooting article: Windows Update issues troubleshooting - Windows Client | Microsoft Learn which also contains additional steps you can perform to troubleshoot update errors. Good luck!