diff --git a/tests/helpers.py b/tests/helpers.py
index 8d79850..9144836 100644
--- a/tests/helpers.py
+++ b/tests/helpers.py
@@ -25,7 +25,12 @@ class Actor:
         # PDS sign in
         self.page.get_by_role("textbox", name="Password").fill(self.password)
         self.page.get_by_role("button", name="Sign in").click()
-        self.page.get_by_role("button", name="Authorize").click()
+
+        # The Authorize button starts disabled while the PDS fetches and
+        # validates client metadata; wait for it to be ready before clicking.
+        authorize_btn = self.page.get_by_role("button", name="Authorize")
+        expect(authorize_btn).to_be_enabled(timeout=15000)
+        authorize_btn.click()
 
         expect(self.page).to_have_url(f"{self.app_url}/")