Event details
Is MicrosoftUpdateManagedOptIn enabled by default, or must we take steps to set that value?
This is opt in policy that enterprises need to enable to be opted into Microsoft Managed Controlled Feature Rollout of certificate updates. Note that, this requires enabling Diagnostics data to enable Microsoft to have visibility to the device bucket to enable the Microsoft managed rollout.
Refer to following links
Group Policy Objects (GPO) method of Secure Boot for Windows devices with IT-managed updates - Microsoft Support for details on the policy
Microsoft Intune method of Secure Boot for Windows devices with IT-managed updates - Microsoft Support for Intune based policies
Configure Windows diagnostic data in your organization - Windows Privacy | Microsoft Learn for how to configure diagnostic data