SetConsole, ...

BTW, looks to me, like LOOPbackA and LoopbackB are not initialised, at least flag is not set.

Yes - same with Bluetooth. I'd just ignore any request to USARTSetup a device that you don't know about.

Does windows expect something, that ESP32 does not deliver or ????

Seems strange... You could give this a try and see if it gives you any useful errors? https://www.microsoft.com/en-us/store/p/­bluetooth-le-explorer/9n0ztkf1qd98