re-authenticate the plugin doesn’t work

I am trying to re-authenticate the plugin and I have followed the tutorial exactly as it says, several times with plugin delete between to clean the database. When I press authenticate and login to my mail, I get a white screen and it just says ”Application not configured” even tho I have everything setup correctly both on our site and on microsoft. Please if anyone know why this is happening, we need our mail to work yesterday and I am clueless..

Best Regards,
Linus