[SFSkol]

This is probably due to your usage of Cortana.
From Microsoft:
"Cortana requires you to sign into a Microsoft Account (MSA) in order to provide the best digital assistance experience. During the setup screens for Cortana, you are guided through the process of signing in with an existing MSA or creating a new MSA. The account you were using to sign into Windows 10 is referred to as a local account, and Cortana requires local account users to switch to an MSA as the primary login to their computer. "

So leave it installed or don't use Cortana.

Windows 10 users have one,but you don't have to use it. But keep the login and password just in case.

Instead change your default email:
Settings, Accounts, Email & app accounts, Add an account. Select Google, add account.
Now that you have your at\alternate email accounts setup you must tell Windows the default
Settings, System, Default Apps, Mail.