diff --git a/playwright/plugins/homeserver/synapse/templates/default/homeserver.yaml b/playwright/plugins/homeserver/synapse/templates/default/homeserver.yaml
index a7f40ab402..76cedb78f8 100644
--- a/playwright/plugins/homeserver/synapse/templates/default/homeserver.yaml
+++ b/playwright/plugins/homeserver/synapse/templates/default/homeserver.yaml
@@ -89,6 +89,7 @@ oidc_providers:
       discover: false
       scopes: ["profile"]
       skip_verification: true
+      client_auth_method: none
       user_mapping_provider:
           config:
               display_name_template: "{{ user.name }}"