Using New Outlook on Windows for personal email, calendar, and contact management
I found this solution - more cumbersome than in the past but not too bad.
Select the email to copy using the check box to the LH side of the email. Do not open the email.
R Click on the email and go down to Save As and select AS MSG. Pick a location on your drive - desktop may work but for sure I saved to a file location.
From the saved location you can then copy and paste normally anywhere you like.
Hope this helps