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I had a similar issue connecting to the microbit and it turned out the USB cable I was using was designed for charging one of those portable lithium ion battery packs and it didn't have the signal wires connected.
Could you have a defective cable?
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I had one more idea about your problem.
I had a similar issue connecting to the microbit and it turned out the USB cable I was using was designed for charging one of those portable lithium ion battery packs and it didn't have the signal wires connected.
Could you have a defective cable?