diff --git a/okta/constants.py b/okta/constants.py
index b9f55cf1..51835c51 100644
--- a/okta/constants.py
+++ b/okta/constants.py
@@ -68,7 +68,8 @@ def find_app_model(sign_on_mode, template_name):
     FT.TOKEN_SOFTWARE_TOTP: models.TotpUserFactor,
     FT.U_2_F: models.U2FUserFactor,
     FT.WEB: models.WebUserFactor,
-    FT.WEBAUTHN: models.WebAuthnUserFactor
+    FT.WEBAUTHN: models.WebAuthnUserFactor,
+    FT.SIGNED_NONCE: models.UserFactor
 }