I use Traefik as reverse proxy and Authentik as SSO IdP. When I connect to my “exposed” service, Traefik middleware determines if I have the appropriate access credentials established. If so, I get access; if not, I’m bounced over to Authentik, where I enter my username, and authenticate via Passkey (modern passwordless gated by private keys behind biometrics unlock). The middleware can also be bypassed based on my pre established private custom HTTP header, so apps doesn’t support the flow (ie mobile client for some apps) can get in directly as well.