Production devices disconnected from Azure IoT Hub - deprecated TLS 1.2 cipher no longer accepted

We respectfully request the following:

1. Please investigate whether any TLS, cipher suite, certificate chain, or security policy changes were implemented on or around July 1, 2026 that could affect legacy TLS 1.2 clients.
2. Please confirm whether strong cipher suite enforcement has changed or is now being enforced differently.
3. If operationally possible, temporarily remove or relax the strong cipher suite enforcement, or restore the June 30, 2026 cipher compatibility, while maintaining TLS 1.2.
4. If this is not technically possible, please provide the exact list of required TLS 1.2 cipher suites, certificate requirements, and any other security changes required so that we can validate our firmware.

Please any guidance on how to formally request a temporary cipher compatibility exception or extended transition period while we roll out new firmware