Outlook mail account errors; server and password issues

Hello,

For the last three days, I’ve been having issues with my email on iPad and iPhone with account errors; cannot get mail, connect to server, and cannot get mail, no password provided for Outlook, also prompts to enter the password. I've tried changing my primary alias back to my msn address, and using that to sign in, instead of the outlook alias’s I had been using previously due to several unauthorized sign in attempts. I changed my password, signed out from my devices and signed in, restarted them, removed my mail account and re-added it again, rebooted my router, contacted my internet provider and Apple support. Right now my mail shows as unauthenticated on IPad, even though I’ve entered password twice today. Any suggestions are greatly appreciated-thanks!