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Outlook | Web | Outlook on the web for business | Sign in
Accessing Outlook on the web for business using organizational credentials.
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Since you mentioned Outlook on the web and your thread's tag is for business, could you please try signing in directly at https://www.microsoft365.com or https://outlook.office365.com using your Microsoft 365 work email address? Outlook on the web requires the work or school account assigned by your organization.
If your email address is no longer being recognized, this may be related to the account itself rather than only Outlook. If possible, please ask your IT administrator to verify in the Microsoft 365 admin center that your user account still exists, is active, and has the appropriate Microsoft 365/Exchange Online license assigned.
To better you situation,, could you please share the exact error message you receive when you enter your email address? A screenshot would also be helpful, but please hide your email address, tenant/domain information, and any other personal or organizational information before posting it, as this is a public forum.
I hope this information helpful and look forward to your response.