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TPM for Autboot not supported

Hello, trying to figure out why some systems within our environment have the Supports TPM for Autoboot property at Not supported. We have autoboot enabled while our staff is WFH due to COVID, but certain devices were not working with it.

I came to realize this was likely because they were imaged under Legacy Boot thus the disk was MBR and I needed to convert these devices to use SecureBoot and be GPT. I scripted this out using Powershell, HP WMI calls, and the MDEMBR2GPT (thankful for this tool!) but some devices are still listed as not supported even after successful conversion to UEFI boot. I am wondering why this is and how I can fix it.

The devices are running DE software/agent versions or

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