Hello Vetri Vetri,
Based on your screenshot, the core issue is that you are attempting to activate an Evaluation edition of Windows Server 2019 using a standard retail or volume license key. The error 0x80070032 typically occurs during this mismatch because the Evaluation media is specifically time-limited (180 days) and doesn't accept permanent activation keys directly through the GUI. You can't simply "activate" an Evaluation copy; you must convert it to a full Retail or Volume edition first.
To resolve this, you need to use the Deployment Image Servicing and Management (DISM) tool via an elevated command prompt to perform the edition conversion. This process will accept your valid product key and remove the evaluation restrictions simultaneously.
Open PowerShell or Command Prompt as Administrator and verify your current edition and target path by running DISM /online /Get-CurrentEdition. You should see ServerStandardEval. Next, identify the possible target editions by running DISM /online /Get-TargetEditions. You should see ServerStandard listed.
To perform the conversion and activation, run the following command, replacing the placeholder X's with your specific product key: DISM /online /Set-Edition:ServerStandard /ProductKey:********* /AcceptEula
(Note: The key visible in your screenshot, KNKMF..., appears to be the generic retail key often used for this conversion or a specific volume license key you possess. If the command fails with that specific key, try using the generic KMS client setup key for Server 2019 Standard first to trigger the conversion: N69G4-B89J2-4G8F4-WWYCC-J464C. Once converted and rebooted, you can then swap in your purchased key via the Settings menu or slmgr /ipk to complete activation.)
After the command runs successfully, the system will prompt you to restart. Upon reboot, the "Evaluation" label will disappear from the desktop watermark and System properties, and the OS will be converted to the full Standard edition.
I hope you've found something useful here. If it helps you get more insight into the issue, it's appreciated to accept the answer. Should you have more questions, feel free to leave a message. Happy new year!
VP