You cannot use slmgr command to install product key(Retail or VLSC MAK key) to evaluation edition server, you will get error message “Error:0xC004F069 On a computer running Microsoft Windows non-core edition….”
- You need a Retail product key and use DISM command to upgrade Edition from evaluation edition to standard (or Datacenter) edition
In case you try activating evaluation version of Windows server 2016 if trying above steps you’ll get following error:
Error: 0xC004F069 On a computer running Microsoft Windows non-core edition, run ‘slui.exe 0x2a 0xC004F069’ to display the error text.
https://geekdudes.wordpress.com/2019/06/27/activating-windows-using-kms-server/
In this case run following commands:
Find available target editions
1 DISM.exe /Online / Get-TargetEditions
Change your target edition (bellow is example for Windows server 2016 datacenter)
1 DISM /online / Set-Edition :ServerStandard /ProductKey:WC2BQ-8NRM3-FDDYY-2BFGV-KHKQY /AcceptEula
Reboot server, repeat above steps and you should be good to go! 
Extras
Easily Activate Windows 10 Pro Free Product Key 64 Bit using CMD Permanently 2020
Note - Must have activate the internet connection
professional product key
W269N-WFGWX-YVC9B-4J6C9-T83GX
And
Open the command prompt ( As admin)
Type below mention CMDS one by one:
# cscript slmgr.vbs /ipk " product pro key " and press the enter.
# cscript slmgr.vbs /skms kms.lotro.cc and Enter
# cscript slmgr.vbs /ato and press the Enter button
!