question

I'd try the activation troubleshooter
https://support.microsoft.com/en-us/help/20527/windows-10-activation-troubleshooter

also from elevated cmd.exe
slmgr /ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx
slmgr /ato

--please don't forget to Accept as answer if the reply is helpful--

Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows Server] Datacenter Management

Disclaimer: This posting is provided "AS IS" with no warranties or guarantees, and confers no rights.

Hi,

Please type "Run" in Windows Search box to open Run box. Then run "slui.exe 4" in Windows run box and activate your system through a phone call.
For other measures to activate Windows 10, we could refer to official article : Activate Windows 10
If you need any further assistance, please reply to us.

Bests,

To activate Windows 10, you need a digital license or a product key. If you're ready to activate, select Open Activation in Settings. Click Change product key to enter a Windows 10 product key. If Windows 10 was previously activated on your device, your copy of Windows 10 should be activated automatically.

Microsoft Support Page - https://support.microsoft.com/en-in/help/4028407/windows-10-activate#:~:text=To%20activate%20Windows%2010%2C%20you,10%20should%20be%20activated%20automatically.

To activate Windows 10, you need a digital license or a product key. If you're ready to activate, select Open Activation in Settings. Click Change product key to enter a Windows 10 product key. If Windows 10 was previously activated on your device, your copy of Windows 10 should be activated automatically.

Microsoft Support Page : https://support.microsoft.com/en-in/help/4028407/windows-10-activate#:~:text=To%20activate%20Windows%2010%2C%20you,10%20should%20be%20activated%20automatically.