To import EML emails into an Outlook 365 account, drag and drop the EML files directly into an Outlook folder. Alternatively, use third-party tools like VSPL EML to Office 365 Migrator to streamline the process by selecting EML files and migrating them directly to the desired Outlook 365 mailbox.

Open Outlook 365 on your desktop.

Create a new folder where you want to import the EML files.

Locate the EML files on your computer.

Simply drag and drop the EML files into the new folder you created in Outlook 365.

The emails will now appear in your selected folder.

For bulk imports, you may use a third-party tool like VSPL EML to Office 365 Migrator to automate the process for multiple emails at once.

https://www.vartikasoftware.com/product/vs-eml-to-office365-converter.html