Deploying against the real Authentik turned this up immediately: its issuer ends in a slash, OIDC requires the discovered issuer to match the configured one byte-for-byte, and trimming it made discovery fail every time. The stub in the tests happened to advertise a slashless issuer, so the whole suite passed while the only provider Petal actually talks to could not be reached. The stub now takes its issuer as a knob, and a regression test runs the flow against one that ends in a slash. Claude-Session: https://claude.ai/code/session_016y6gyuHkQXPiEuW8RGQyua