Guest Attestation Extension Should be Installed on XYZ

Description:

Install Guest Attestation extension to allow Azure Security Center to proactively attest and monitor the boot integrity. Once installed, boot integrity will be attested via Remote Attestation.

Remediation/Reference:

Trusted launch requires the creation of new virtual machines.
You can't enable trusted launch on existing virtual machines that were initially created without it.
Trusted launch is currently in public preview. The preview is provided without a service level agreement, and it's not recommended for production workloads. Certain features might not be supported or might have constrained capabilities.

https://docs.microsoft.com/en-us/azure/virtual-machines/trusted-launch?WT.mc_id=Portal-Microsoft_Azure_Security