Before you try this workaround, first sign out of Outlook on the Web, and then sign back in and see if the missing default folders are restored. If not, you can create an Outlook.com email alias.

If you’ve ever sent an email and then realize that it was missing key details ... 365 or the new Outlook for Windows included in Windows 11, look for “Sent Items” in the left folder pane ...

However, if it’s done accidentally, you can try and correct this mistake by editing the old email and adding all the missing information. Microsoft Outlook ... will open the sent message so ...