diff --git a/lib/src/core/authentication-core.ts b/lib/src/core/authentication-core.ts
index 69712e12..3b14e712 100644
--- a/lib/src/core/authentication-core.ts
+++ b/lib/src/core/authentication-core.ts
@@ -552,7 +552,7 @@ export class AuthenticationCore<T> {
                 "AUTH_CORE-GSOU-NF02",
                 "authentication-core",
                 "getSignOutURL",
-                "ID token n0t found.",
+                "ID token not found.",
                 "No ID token could be found. Either the session information is lost or you have not signed in."
             );
         }
diff --git a/lib/src/helpers/authentication-helper.ts b/lib/src/helpers/authentication-helper.ts
index 11b88bc1..489ea951 100644
--- a/lib/src/helpers/authentication-helper.ts
+++ b/lib/src/helpers/authentication-helper.ts
@@ -149,7 +149,7 @@ export class AuthenticationHelper<T> {
                             jwk,
                             (await this._config()).clientID,
                             issuer,
-                            AuthenticationUtils.getAuthenticatedUserInfo(idToken).username,
+                            CryptoUtils.decodeIDToken(idToken).sub,
                             (await this._config()).clockTolerance
                         )
                             .then((response) => response)