Extensibility Implementation Error

Hi All

Sign ups have started to fail on an applicaton.

I have no idea where to start to look.

Thanks

The error is:

{
“date”: “2025-11-20T20:17:52.356Z”,
“type”: “fs”,
“description”: “ExtensibilityImplementationError on pre-user-registration: Unexpected undefined error response payload from extension URL https://webtask-router.space.local/api/run/redacted/check-user, missing / invalid .message or .statusCode”,
“connection”: “Username-Password-Authentication”,
“connection_id”: “con_VH4k6nPcebIxZnoM”,
“client_id”: “tvEFZqJfrtitgDdM976fnmBPkFZvTfmk”,
“client_name”: “Alexa”,
“ip”: “2603:9000:9a02:1aea:f688:334d:9bdd:6d3d”,
“user_agent”: “Chrome Mobile 142.0.0 / Android 10.0.0”,
“details”: {
“body”: {
“connection”: “Username-Password-Authentication”,
“client_id”: “redacted”,
“email”: “redacted”,
“password”: “*****”,
“is_signup”: true,
“tenant”: “redacted”,
“transaction”: {
“id”: “redacted”,
“locale”: “en”,
“protocol”: “oidc-basic-profile”,
“requested_scopes”: [
“openid”,
“email”,
“offline_access”,
“profile”
],
“acr_values”: ,
“ui_locales”: ,
“redirect_uri”: “ Account Linking ,
“prompt”: ,
“state”:
“response_type”: [
“code”
]
},
“form”: {},
“request_language”: “en-US,en;q=0.9”
},
“authentication_methods”: [
“pwd”
]
},
“user_id”: “”,
“user_name”: “redacted”,
“strategy”: “auth0”,
“strategy_type”: “database”,
“$event_schema”: {
“version”: “1.0.0”
},
“environment_name”: “prod-eu-1”,
“log_id”: “redacted”,
“tenant_name”: “redacted”,
“_id”: “90020251120201752545211000000000000001223372142986860210”,
“isMobile”: true,
“location_info”: {},
“id”: “redacted”
}