convert the machine to GPT using How to convert MBR to GPT drive to switch BIOS to UEFI on Windows 10 | Windows Central
The VM will then fail to boot up, so you have to change the config.pvs file for the VM to set EFI Enabled to 1. Save the file and close it.
Once you've done that, you'll be able to add a TPM to the machine in the Parallels GUI

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