Have you tried setting clientID match outlook in ~/.davmail.properties davmail.mode=O365Manual davmail.oauth.clientId=d3590ed6-52b3-4102-aeff-aad2292ab

Have you tried setting clientID match outlook in ~/.davmail.properties davmail.mode=O365Manual davmail.oauth.clientId=d3590ed6-52b3-4102-aeff-aad2292ab01c davmail.oauth.redirectUri=urn:ietf:wg:oauth:2.0:oob https://sourceforge.net/p/davmail/discussion/644057/thread/a7061b73cb/ https://sourceforge.net/p/davmail/discussion/644057/thread/a... FWIW, user for login looks like: user@domain.tld