My main e-mail is an old bellsouth.net account which is user ID for Microsoft account

Research up to now has revealed following, I am aware that many linked account are being disabled in Outlook.com.

My bellsouth.net POP3 email address is used as my id for Microsoft Account, but I have a different password on Microsoft Account.

Received message when checking setting on email that the bellsouth.net address password was incorrect on link to email. Outlook.com keeps rejecting change when I try to correct and save. This problem only affects incoming mail on bellsouth.net account which is main email address.

Outlook list the bellsouth.net account as an alias but I believe it was set up as linked account. bellsouth,net account used as Microsoft Account Id say it can receive and send but as that has different password it is not retrieving my email.

When Microsoft Account was opened bellsouth.net address and yahoo,com password was used to divert mail to Microsoft Servers. This address is also what is called a legacy account address and is supported on non ATT servers unless supported by yahoo.  Is it possible with all the changes being made that Outlook is try to import that email using Microsoft Account password?  What is best way to restore service and maintain access to the bellsouth.net account using Outlook.com as email service?

Hope this is enough info

Thanks boudreau1863