INT_RSA_VERIFY:bad signature on Android64

Hi. I have an application using websockets to connect to an MQTT server. It works fine on Windows and Android32, but fails to connect under Android64. Yes I double-checked that I've added the correct SSL library files to the deployment! The error is:

https://i.postimg.cc/wj0QBMQT/image.png

I've tested on a phone (Android 11) and tablet (Android 10) and confirmed that the Android32 version does work on these.

I'm using Delphi 11.1 and the latest (downloaded Monday) sgcWebSockets.

Dave