Does the new HP laptop not come with a default user login?
Once logged in you can go to accounts under settings and see if you can login with your account.
Remember the account requires the full e-mail address and is case sensitive.
If you do have access to
https://account.microsoft.com go to login from there if it doesn't work click on "forgot password" and it will likely send to your specified email account to reset. I would also setup microsoft authenticator on your phone for easy reseting and better security.