You need a 2012r2 KMS key to activate both hosts and clients at 8.1 level, do you have a valid SA on your 2012 license? Otherwise you will have to use a different host for KMS duties.

You can successfully fix Activation Error Code 0x80041024 on Windows 11/10 computers by following the suggestions laid down in this post.

The very first thing that you need to do when trying to fix activation error code 0xc004f063 is to run the automated Windows Activation Troubleshooter.

Microsoft has confirmed that Windows 7 and 8 keys can no longer activate any Windows 11 edition or version, not just Canary builds, as reported in September. However, Windows 10 keys are still valid.