If its a retail license, you will need to contact chat support to reactivate:
Use the following link to directly reach a live agent who can assist you:
Reinstall Windows 10 from Mac Parallels to Boot Camp
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Anonymous
I have a mac and had Windows 10 activated on a Parallels partition. I now want to transfer Windows 10 to the Boot Camp partition. However, activation will not allow me to reactivate the digital license into the Boot Camp partition.
Windows for home | Windows 10 | Install and upgrade
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Anonymous
2018-05-30T11:10:56+00:00 -
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Pauli O 15,375 Reputation points Volunteer Moderator2018-05-30T10:58:48+00:00 Virtual Machine environment like Parallels and Mac (with Boot Camp) are separate "computers" and those can't use same license.
Your Windows license is linked to Parallels "hardware ID" and can't be transferred to mac unless you have Retail license. You can check your license type in Command Prompt (CMD) with command: slmgr /dli
That is exactly same situation as using Hyper-V or VMWare on Windows PC. Those virtual machines need their own licenses.