Hello,
How did you obtain your license initially?
Did it come with the device preinstalled, or did you purchase it?
If you purchased it, did you purchase from Microsoft, or from third party?
Is it originally a Win7/8 key?
Just to make sure, is motherboard changed? Or is this first time using it?
As for the internet issue, Can you go check your Windows Settings > Windows update, and see if you might have KB5085516 available to install?
KB5085516 was released on March 21st to address Microsoft account sign in issue (giving internet not connected error) among some apps caused by KB5079473 https://support.microsoft.com/topic/march-21-2026-kb5085516-os-builds-26200-8039-and-26100-8039-out-of-band-09e85404-1cb6-4ed4-9ca5-3e40d74307b9