diff --git a/services/web/app/src/Features/Errors/Errors.js b/services/web/app/src/Features/Errors/Errors.js
index 1ca6374a4b..e5358670f8 100644
--- a/services/web/app/src/Features/Errors/Errors.js
+++ b/services/web/app/src/Features/Errors/Errors.js
@@ -134,6 +134,12 @@ class SAMLLoginFailureError extends SAMLAuthenticationError {
   }
 }
 
+class SAMLEmailNotRecognizedError extends SAMLAuthenticationError {
+  get i18nKey() {
+    return 'saml_email_not_recognized'
+  }
+}
+
 class SAMLSessionDataMissing extends BackwardCompatibleError {
   constructor(arg) {
     super(arg)
@@ -270,6 +276,7 @@ module.exports = {
   SAMLMissingSignatureError,
   SAMLInvalidResponseError,
   SAMLLoginFailureError,
+  SAMLEmailNotRecognizedError,
   SLInV2Error,
   ThirdPartyIdentityExistsError,
   ThirdPartyUserNotFoundError,
diff --git a/services/web/locales/en.json b/services/web/locales/en.json
index 860f21a4b3..46cf85d4ae 100644
--- a/services/web/locales/en.json
+++ b/services/web/locales/en.json
@@ -1533,6 +1533,7 @@
   "saml": "SAML",
   "saml_auth_error": "Sorry, your identity provider responded with an error.  Please contact your administrator for more information.",
   "saml_create_admin_instructions": "Choose an email address for the first __appName__ admin account. This should correspond to an account in the SAML system. You will then be asked to log in with this account.",
+  "saml_email_not_recognized_error": "This email address isn’t set up for SSO. Please check it and try again or contact your administrator.",
   "saml_identity_exists_error": "Sorry, the identity returned by your identity provider is already linked with a different Overleaf account.  Please contact your administrator for more information.",
   "saml_invalid_signature_error": "Sorry, the information received from your identity provider has an invalid signature.  Please contact your administrator for more information.",
   "saml_login_disabled_error": "Sorry, single sign-on login has been disabled for __email__.  Please contact your administrator for more information.",