I have appended the itempotency_key value to the formData before posting to https://challenges.cloudflare.com/turnstile/v0/siteverify however, I still get the error timeout-or-duplicate. Even with the itempotency_key hardcoded, it still throws the error. Not sure if I’m doing something incorrectly here.
Hello! We looked into this issue and found a small bug. The fix will go out in the next few weeks (early-mid October). In the meantime, we isolated this issue to only form data requests. Sending a JSON request should work as expected.