diff --git a/LearningHub.Nhs.UserApi.Services/RegistrationService.cs b/LearningHub.Nhs.UserApi.Services/RegistrationService.cs
index 7dccbaf..f3dccd3 100644
--- a/LearningHub.Nhs.UserApi.Services/RegistrationService.cs
+++ b/LearningHub.Nhs.UserApi.Services/RegistrationService.cs
@@ -336,7 +336,7 @@ public async Task<LearningHubValidationResult> RegisterUser(RegistrationRequestV
                         ExternalSystemId = registrationRequest.ExternalSystemId.Value,
                     };
 
-                    await this.externalSystemUserRepository.CreateAsync(userId, userExternalSystem);
+                    await this.externalSystemUserRepository.CreateExternalSystemUserAsync(userExternalSystem);
                 }
 
                 if (registrationRequest.IsExternalUser == false)