To be systematic about it, on a fresh browser session:
- go to review.haiku-os.org
- click “sign in”, get asked for username
- give username, get asked for password
- on submitting the password I get a 404
- the URL on that page is (with codes removed):
https://review.haiku-os.org/oauth?state=[...]&iss=https%3A%2F%2Fsso.haiku-os.org%2Frealms%2Fhaiku&code=[...]
- if I go back to review.haiku-os.org from there I’m not signed in
- if I click “sign in” at that point I get a 403
So the problem seems to start with sso’s redirect to review landing on a 404?