Our Engineering Team has found the issue when the May Windows Cumulative update KB5025885 can't be installed in a Windows 11 virtual machine in Parallels Desktop. You might see the following error message:
Insufficient NVRAM resources exist to complete the requested service. A reboot might be required. when attempting to update a Secure Boot variable. For more information, please see https://go.microsoft.com/fwlink/?linkid=2169931
Resolution
The issue has been fixed in Parallels Desktop 18.3.0. Update Parallels Desktop to the latest version by right-clicking the Parallels Desktop icon in Dock > Check for updates...
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