Yes. If you originally signed up using one SSO provider (such as Google) and want to log in with another (such as Microsoft) using the same email address, you do not need to recreate your account.
You'll need to connect the new provider to your existing account, which adds it as an additional login option.
While you are logged in (using your current ex. Google SSO), go to your Settings > My Calendars and connect your Outlook calendar.
Once the Outlook calendar is connected, it is added as an additional authentication option on the same account. You can then log in with either Google or Microsoft.
