Hi Gluu Support Team, Facing the issue with Super Gluu IOS app authentication. It is failing. Possible to provide some inputs on this Expected Behaviour ------- After registration with Super Gluu app, during authentication (using Super Gluu auth), expected to see "Authentication sucussful". Current Behaviour ------------ After registration of my device(tying user to device), the usual authentication should be sucussful. But with Super Gluu, RP-app and Gluu server in the system, the authentication was not sucussful. The message I get in the Super Gluu IOS app is: Oops! Authentication failed. Try again. We are observed from the oxAuth logs obtained from the Gluu console that we see something like: auth.ws.rs.fido.u2f.U2fAuthenticationWSexception: Signature is not valid It seems the undelying Fido issue. System Details --- 1. Installed Super Gluu app on IOS and did the basic user configuration as per Super Gluu specs 2. In cloud space 2 components running on the same machine. - Gluu server 4.3 running on Ubuntu 20.04 - Oxd server running within Gluu - Oxd-spring test app (obtained from Gluu Git hub) running in the same server as a spring boot jar. Minor modifications to Pom xml and app properties. Configuration details ----- [1]In Gluu server have created a user (other than admin) [2]In Gluu Server, have enabled Super Gluu and made it as the default authentication for default acr field. [3] In Gluu server, in configuration->Manage Custom Scripts, have activated the Super Gluu 2FA authentication.