Sending, receiving, and organizing email in Outlook.com
Hi,
May I ask what are the changes were made to the account prior to having the issue?
What methods or solutions have you already tried to fix the issue?
Does this happen when you try to use incognito or InPrivate mode in a browser?
Have you also tried using another browser or browsers on other devices?
Outlook Error 500 can be caused by various issues, and doing and asking the above questions helps to isolate the issue.
I look forward to your response.
Stay Safe!