Replace this template with your information
Describe your question in as much detail as possible:
I have recently installed Gitlab on my Raspberry Pi 4, and configured login with Github.
- What are you seeing, and how does it differ from what you expect to see?
When I try linking my Gitlab account with my Github account, I get a 404 error. I expected a Github login page, or a page requesting permission to acess the account.
- Consider including screenshots, error messages, and/or other helpful visuals
Screenshots attached.
- What version are you on (Hint:
/help) ? and are you using self-managed or gitlab.com?
Self-managed.
- What troubleshooting steps have you already taken? Can you link to any docs or other resources so we know where you have been?
I have tried changing the callback url to /auth, /users, and /users/auth/github. The first 2 gave the same 404 error, whereas the last on gives me an acess denied error.
Thanks for taking the time to be thorough in your request, it really helps! 
