lost product key

as part of the windows insiders I've had nothing but trouble since they upgraded my operating system from windows 10 home to windows 10 pro. it is now saying that my copy of windows is not genuine and not active. I've used this laptop for the last ten years plus and never had any issues until now

someone please help with this issue as Microsoft have not helped and I'm going round in circles and i refuse to buy one because of an update issue