You are welcome.
Here are your options
Go to https://account.live.com. Sign into the Microsoft account that has the OneDrive subscription.
Go to Your Info > Sign in preference, Add an alias.
You have two options here:
Create new: this will allow you to use the native domain outlook.com to create a new alias.
Add existing: this will allow you to add a 3rd party email address (cannot be outlook, hotmail, or live.com), such as yahoo, gmail, as long as they are not already associated with another Microsoft account.
Once added, make this new alias your primary alias.