Hi!
On which device are you using Outlook Web?
Is your email from Microsoft, Gmail, or your own/business/educational domain?
Have you tried it on another device? Access Outlook Web from another computer or mobile phone. You can also download Outlook Mobile and log in.
Check if your account has been blocked: https://support.microsoft.com/en-us/office/unblock-my-outlook-com-account-f4ad2701-d166-4d8b-8a6a-9af2a1f8a4c4