X_AUTH_SIGN_IN_UNCONFIGURED
Means
a people-facing role started with no sign-in settings outside development and test
Typical cause
x g sign-in wrote a boot guard, and a web or sync role started with the sign-in env keys unset
Fix
export <KEY>="<value>" for every unset key the cause names — in the role's deployed environment (compose environment:, the platform's secrets), then restart the role