migration doesn't launch, says to quit program and close apps. there are no apps open.

Are you doing this on a Windows machine?

If so, this might help: Move your data from a Windows PC to a Mac - Apple Support

As to Edge, it may be running in Background and not be visible. Open Task Manager by right clicking a blank space the task bar and look for Edge under Processes. If there, shut it down.

If Edge is found under Startup, disable it.

Reboot and try again.

Is MS Edge on the Windows computer set to " run in the background " when the computer is first started ?

From memory, MS does offer this as a way for faster Search's on their platform