Thank you for reaching out to Microsoft Q&A Platform .
And unfortunately , This is by design behavior :
According to documentation, having "Security type: Trusted launch enabled "will not allow Backup and Azure Site recovery to work on that VM.
Ref:
https://learn.microsoft.com/en-us/azure/virtual-machines/trusted-launch-portal?tabs=portal
https://learn.microsoft.com/en-us/azure/virtual-machines/trusted-launch#faq
Thanks & Regards,
Pradeep
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