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@Technogeezer wrote:

managedVM.autoAddVTPM = "software"

My advice is to restore the Workstation 15 version of the VM, remove this line from the .vmx file with your favorite text editor, then power up the VM with Workstation 17. If you get the VM powered up and you want a TPM for your Windows 11 VM, modify the VM's settings to reflect that you have a Windows 11 VM, enable encryption (choosing "only files necessary to support a TPM device"), specify a password (don't let Workstation generate one for you), and decided whether you want that password saved by Windows. Then you can add the TPM device. 

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Followed this and all is now perfect.  Thank you very much for all your time and effort, it's greatly appreciated.

Greg