Error regarding synchronizing folders

For the last few weeks when my Outlook 365 tries to send/receive messages I get an error that says Task 'Synchronizing subscribed folders for [Edited by Moderator].' reported error (0x800CCC0E) : 'Outlook cannot synchronize subscribed folders for [Edited by Moderator]. Error: Cannot connect to the server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).' I've checked my settings for imap and stmp. If I do a test email I receive that on my phone but haven't received any emails in my Outlook for several weeks.