How to connect to Outlook Live (Office 365)
Microsoft removed the ability to connect any other accounts to Outlook.com and Outlook.live.com on May 10, 2021, but accounts connected before May 10, 2021, will continue to sync unless they are removed manually.
Microsoft 365 subscribers can add their Google Mail and Calendar accounts as an additional mailbox but no other email accounts can be added on Outlook.com.
You may use Outlook for iOS or Outlook for Android to sync your email accounts on your mobile phone.