Hi Dom,
To my knowledge, the private key for this certificate has been marked as not exportable. This is defined in the certificate template, and marked during generating the certificate.
Thus, you just can't export the private key.
In addition, since this is a forum mainly covering questions about MATA, I would recommend to submit a new question on the following forum for better support.
https://social.technet.microsoft.com/Forums/en-US/home?forum=winservergen&filter=alltypes&sort=lastpostdesc
Best regards,
Andy Liu
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