i have an error when setting up the device with microbit uart

I don't know what to do with an extension named microbit_UART1. When I try to use microbit_UART1.bluetoothdevice. Then something happens. Shows that I don't know how to use it. I try to connect to my microbit circuit using the bluetoothLE1 extension pack and it seems to be connected successfully, but I cannot send a string to the microbit circuit.


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I have the same problem. Have you solve it?