Thanks!
First, check if the date and time on your Windows clock are correct.
Since it stopped working suddenly, it is important to test whether you can access the website https://account.microsoft.com/account > Try logging in with your account.
If you are unable to do so, check if the account is blocked: https://support.microsoft.com/en-us/office/unblock-my-outlook-com-account-f4ad2701-d166-4d8b-8a6a-9af2a1f8a4c4
- If you notice anything strange or an unfamiliar email, let me know.