I have recently started getting a certificate error when trying to authenticate. Below is from me using my issuer-uri within the sample application:
I/O error on GET request for “https://kainoshealthcare.auth0.com/.well-known/openid-configuration”: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target; nested exception is javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target