IoT Device (EC200U + ESP32-S3) Fails HTTPS POST to Render-Hosted API

Hi Render Team,

I’m using a Quectel EC200U-CN 4G module with an ESP32-S3 to send HTTPS POST requests to my Render-hosted API

The connection setup works (AT+QIACT, SSL/TLS configs return OK), but the AT+QHTTPPOST` command fails with: +CME ERROR: 732

The endpoint works fine in Postman and browsers.
Questions:

Does Render enforce specific TLS settings, like SNI, HTTP/2, or limited cipher suites?
Any way to view server-side logs for failed TLS handshakes?

Appreciate any help!