Does LUA 2.3.x supports mTLS for https communication ?
Mutual Transport Layer Security (MTLS) protocols provide encrypted communications and endpoint authentication on the Internet.
You may wish to configure LUA to download definitions over https using mTLS however it does not work as LUA does not support mTLS .
Refer - https://docs.microsoft.com/en-us/skypeforbusiness/plan-your-deployment/security/tls-and-mtls
As of LUA 2.3.9 Version, LUA does not support mTLS.