Have similar issue, but this did not help.
The app ran flawlessly, until one day, it just did not start. I restarted PC, I reinstalled the app, I did also erase everything as you stated, but nothing happens. I ran the app as an administrator, after cca 1 minute the app starts and I can log in. Or can I? After I hit the Log In button, for a second it seems like it is loading, then the app disappears and it never starts. Once it randomly started after tens of minutes.
Every other app runs perfectly correct in my PC. Steam, Epic, Discord, browser, other games, everything.
Thank you, in advance.