Best posts made by gob

@george1421
This worked.
Thank you.

Thanks @THEMCV I’m sure you’re correct there. We do have encryption tools which manages Bitlocker and those tools are disabled for these machines however manage-bde -status does show that the drive is currently being encrypted!
We are decrypting the drive now and will try again later.

thanks

Problem solved. It was indeed the background encryption that prevented the resizing.

thanks again @THEMCV