Under Incoming Mail Settings
Server Name / IP Address -- outlook.office365.com
Email Type -- POPS 995 or IMAPS 993
Under Outgoing Mail Settings
Server Name / IP Address -- smtp.office365.com
Email Type -- SMTP 587
Once the mail server settings is configured successfully and fetching is initiated, it should display the last fetch time. Please configure the mail settings as given above and check whether the issue persist.