diff --git a/e2e/helpers.ts b/e2e/helpers.ts
index e3d251c69..006d20acb 100644
--- a/e2e/helpers.ts
+++ b/e2e/helpers.ts
@@ -42,7 +42,18 @@ export function collectConsole(page: Page): ConsoleCollector {
   const errors: string[] = [];
   const pageErrors: string[] = [];
   page.on('console', (msg) => {
-    if (msg.type() === 'error') errors.push(msg.text());
+    if (msg.type() !== 'error') return;
+    // The login page's registration probe (POST /_matrix/client/v3/register)
+    // answers 403 "Registration has been disabled" on a homeserver with sign-up
+    // closed (matrix.lotusguild.org since 2026-10-16: accounts come from SSO).
+    // Allowed only for that URL so any other 403 still fails the test.
+    if (
+      /status of 403/.test(msg.text()) &&
+      /\/_matrix\/client\/v3\/register/.test(msg.location().url)
+    ) {
+      return;
+    }
+    errors.push(msg.text());
   });
   page.on('pageerror', (err) => {
     pageErrors.push(err.message);