Product Key Command Activate Part 2

 
https://techcommunity.microsoft.com/t5/windows-server-for-it-pro/activationg-trial-version-of-server-2019/m-p/1203975

 

https://learn.microsoft.com/en-us/windows-server/get-started/kms-client-activation-keys 

To change the eval version of Server 2019 to a retail version you have to use dism.

Use the following steps in and administrative command prompt:

1. slmgr /upk
2. slmgr /cpky
3. dism /online /set-edition:ServerStandard /accepteula /productkey:<YOUR-RETAIL-KEY-GOES-HERE>
4. reboot
5. slmgr /ipk <PRODUCT-KEY-GOES-HERE>
6. wait a minute
7. slmgr /ato