Can't get to start discord on windows startup

I have the issue that my regular discord instance is not, for whatever reason, starting up with windows. I tried to see if discord ptb is behaving the same way but that starts with windows with no issues.

So I want to try fully uninstalling everything related to discord to have a fresh install of it. I don't want to be forced to use discord ptb which is not 100% stable.

Can someone tell me where exactly all the nested stuff for discord is. Registry, hidden files in /programdata or whatever.

thank you very much.

PS: if someone can tell me how to fix it without uninstalling everything would also be greatly appreciated. 

Edit(11/14/2021):

Used Microsofts AutoRuns sysinternals tool and added the missing registry. Works now.

In the following path in the registry:

"Computer\HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run" 

I added the following REG_SZ string with

"C:\Users\Kadircan\AppData\Local\Discord\Update.exe --processStart Discord.exe"

There is also a parameter for starting it in the Tray but can't remember.