On the wire
Ships with HTTP status 404, carrying "code": "RU-4018" in the response body alongside the human-readable error message. Existing fields are never replaced by the code: it is additive.
Common causes
- Two-way sync was never turned on for this connection under Account settings > Integrations.
- The connection was deleted after the webhook URL was configured in the provider.
- The webhook URL was pasted into the wrong provider's webhook settings (a GitHub URL configured in Linear, or similar).
How to fix it
- Open Account settings > Integrations > Issue trackers and confirm two-way sync is on for this connection.
- Copy the webhook URL shown there again and compare it against what the provider is actually configured to call.
Related codes
Still stuck?
Ask support and mention RU-4018: the code pins down the exact refusal path, so you skip the diagnostic back-and-forth.