Hi @strik3rgaming and welcome to the forums.
I can see that you have commented on an old thread from May 2021. This thread is regarding an issue using the mouse on a PS5.
I have checked your account and can see that you have not played Assassin's Creed Valhalla and that you play on PC not PS5. Can you confirm if you are playing the game on PS5 using a different Ubisoft account and that you are unable to use your mouse?