For me the only thing that lets ADB be detected on the PC (be it Windows or Linux) is actually toggling the "Enable ADB over USB" checkbox while connected to the USB. If you reboot the reader while connected, it gets detected as well.
Something about the sequence of ADB and other USB processes in the reader coming up. I cannot explain it.
What works for me every time is clicking on the checkbox to turn it off, then immediately turning it back on.
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