New laptop windows 11 libre office issue

All data from windows 10 laptop transferred to windows 11 laptop including libre office and all was there and working well, but now when opening an previous excel document, a constant window pops up from microsoft saying Sign In To Get Started With Excel with two options sign in and create an account or i have a product key. Don’t know how to get rid of this as libre office was working fine and I could search for any document and it would bring it right up, but no longer

addendum; i press escape button and it will go away and is replaced by a red notice saying ; MOST FEATURES ARE DISABLED BECAUSE YOUR OFFICE PRODUCT IS INACTIVE TO USE FOR FREE SIGN IN AND USE THE WEB VERSION when you click activate it takes me right back to the window for microsoft office 365