Hi!
Thank you for posting your query to community forum!
As I understand your Windows product key is not working, showing error key not valid. Since you purchased Windows 11 from Newegg, it's best to reach out to their customer support for assistance. They should be able to verify the key and help you resolve any activation issues. Microsoft typically provides support for Windows activation issues, but in this case, the key was purchased through Newegg, a third-party retailer. Since product keys are managed by the seller, Newegg is responsible for verifying and resolving any issues with the activation.
I hope this answers your query, but if you need further assistance feel free to reply.
Best regards,
Scott | Microsoft Community Moderator.