Common issues like: Certain Files being corrupted, if everything fails and you really have no other options: reinstall your OS.
Unpopular trick that can help and maybe even fix the problem sometimes:
Changing your Epic Games Account info, For example: password and restarting Epic Games Services.
Do i still have this issue?
Yes and i hope they (Epic Games) Will fix it soon.
MY PROPOSAL: ADD A LOGIN SCREEN BEFORE THE PROGRAMM STARTS OR IF THE LOGIN ERROR IS CAUSED!
(its really not rocket science, but im no programmer)
Ive had this issue as long as last season at this point.