diff --git a/user.go b/user.go
index abf58cb..b4eb1e8 100644
--- a/user.go
+++ b/user.go
@@ -382,7 +382,11 @@ func (u *DynamoUser) FinishLogin(r *http.Request) (*webauthn.Credential, error)
 
 	credential, err := u.WebAuthnClient.ValidateLogin(u, u.SessionData, parsedResponse)
 	if err != nil {
-		log.Printf("failed to validate login: %s", err)
+		var protocolError *protocol.Error
+		if errors.As(err, &protocolError) {
+			log.Printf("failed to validate login, ProtocolError: %s, DevInfo: %s",
+				protocolError.Details, protocolError.DevInfo)
+		}
 		return &webauthn.Credential{}, fmt.Errorf("failed to validate login: %s", err)
 	}