Additional sign-in or account-related issues within Microsoft Teams Free
Hello
So, right now you have two separate Microsoft accounts.
Account 1 is using aol.com address.
Account 2 is using outlook.com address.
You can move the aol.com address from account 1 to account 2, but not the another way around. Also you need to remove aol.com from account 1 first before you can move it to account 2.
To do that, sign into account 1 via https://account.live.com. Go to Your info > sign in preference > Add alias, create a new one, which is outlook.com address. Once created, make the new one primary. Then remove aol.com address.
Then sign out of everything, and sign back into that link with account 2, go to Your info > sign in preference > add alias > add existing, you should now be able to add the aol.com address.