I have to use existing user login session, we will require EDGE user profile, as we observed EDGE driver doesn't use the existing user data profile it is creating a new profile every time
EDGE Default Profile Path
C:\Users\edge2automation\AppData\Local\Microsoft\Edge\User Data\Default
(Edge driver) path -
C:\Users\edge2automation\AppData\Local\Temp\scoped_dir64860_1277252271\Default
As the new Edge is based on Chromium, we can refer to the solution of using Chrome profile and change the key words to Edge:
Please note that this needs to use selenium-server-4.0.0-alpha-4 which you can download form here.