Hey there! Nice to meet you!
Unfortunately, there is a service alert for the Outlook server regarding sign‑in issues: https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect
Kindly try the Microsoft Sign‑in Helper troubleshooter in case this works: https://support.microsoft.com/account-billing/microsoft-account-sign-in-helper-7117cc8d-0d68-4658-b4fb-c4b7ee8a8e28
If the issue persists, you may need to wait at least a few hours and check the server status from time to time.
Thank you for your understanding.
Best regards,
Darhyl