diff --git a/src/api/router/auth.rs b/src/api/router/auth.rs
index 01254c32..add596c6 100644
--- a/src/api/router/auth.rs
+++ b/src/api/router/auth.rs
@@ -220,6 +220,10 @@ async fn auth_appservice(
 		return Err!(Request(Exclusive("User is not in namespace.")));
 	}
 
+	if !services.users.exists(&user_id).await {
+		services.users.create(&user_id, None)?;
+	}
+
 	Ok(Auth {
 		origin: None,
 		sender_user: Some(user_id),