Why does Microsoft Outlook keep asking for Password

Why does Microsoft Outlook keeps constantly asking for Password. I even had to change my password thinking it would help. It didn't. Even after I enter password, still continues prompting me to enter password. Just does not go away. And it is also affecting my account with Spectrum Roadrunner to perform other functions that I was able to do without having to enter a password. This problem just recently started and Spectrum can't help since it's a Microsoft issue causing the problem. Tried to get help by calling Microsoft by using the recommended website since I'm unable to get a live person to talk to, but the website Microsoft is directing to go for HELP wants to charge a Fee plus a monthly fee. We purchased Microsoft. Didn't use to have this issue