diff --git a/services/web/app/src/Features/Errors/Errors.js b/services/web/app/src/Features/Errors/Errors.js
index b19f4f4344..7eb37d7a2b 100644
--- a/services/web/app/src/Features/Errors/Errors.js
+++ b/services/web/app/src/Features/Errors/Errors.js
@@ -198,6 +198,8 @@ class SAMLRequestDeniedError extends SAMLAuthenticationError {
 
 class SAMLDomainCaptureManagedUserMissingEmailError extends OError {}
 
+class SAMLDomainCaptureManagedOptInUserMissingEmailError extends SAMLDomainCaptureError {}
+
 class SAMLSessionDataMissing extends BackwardCompatibleError {
   constructor(arg) {
     super(arg)
@@ -383,6 +385,7 @@ module.exports = {
   SAMLRequestDeniedError,
   SAMLDomainCaptureRegisterError,
   SAMLDomainCaptureManagedUserMissingEmailError,
+  SAMLDomainCaptureManagedOptInUserMissingEmailError,
   SLInV2Error,
   ThirdPartyIdentityExistsError,
   ThirdPartyUserNotFoundError,
diff --git a/services/web/frontend/extracted-translations.json b/services/web/frontend/extracted-translations.json
index 4b6fa33f01..982097f7f6 100644
--- a/services/web/frontend/extracted-translations.json
+++ b/services/web/frontend/extracted-translations.json
@@ -1530,7 +1530,7 @@
   "role": "",
   "rolling_texlive_build": "",
   "saml_auth_error": "",
-  "saml_email_not_in_account_error": "",
+  "saml_email_not_in_account_error_managed_users": "",
   "saml_identity_exists_error": "",
   "saml_invalid_signature_error": "",
   "saml_login_disabled_error": "",
diff --git a/services/web/locales/en.json b/services/web/locales/en.json
index f9865a90a1..c2b4402e61 100644
--- a/services/web/locales/en.json
+++ b/services/web/locales/en.json
@@ -1986,7 +1986,7 @@
   "saml_authentication_required_error": "Other login methods have been disabled by your group administrator. Please use your group SSO login.",
   "saml_commons_unavailable": "Institution SSO is currently unavailable. For more details, please see <0>__linkText__</0>.",
   "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_in_account_error": "Your identity provider returned __email__, which is not already on your current __appName__ account. You will need to log out and create a new __appName__ account with __email__ via the SSO log in page. Once this is done, you can <0>transfer your existing projects</0> to the new account.",
+  "saml_email_not_in_account_error_managed_users": "Your identity provider returned __email__, which is not already on your current __appName__ account. You will need to log out and create a new __appName__ account with __email__ via the SSO log in page. Once this is done, you can <0>transfer your existing projects</0> to the new 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.",