Contact Form 7 displays a spinner after the Send button is pressed. No success or error message follows. The AJAX request never returns a valid JSON response.
The most common reason is a missing or broken JavaScript file. If jQuery is not present or the Contact Form 7 script is not enqueued, the request never starts.
Server side problems also stop the response. PHP fatal errors, memory limits, or ModSecurity rules may abort the request before JSON is generated.
Extra output from themes or plugins corrupts the JSON. Any echo, whitespace, or HTML before the JSON makes the browser reject the response.
CORS mismatches, nonce expiration, or caching layers block the POST. The request is sent but the server refuses or the response is cached incorrectly.
When the response fails, the form shows the generic fallback message. Submissions are not stored in Flamingo or other databases.