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Enable the option "Reset Authenticator"

Then, click "Assign" 

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Plug in the FIDO key (If it is already plugged in, you need to unplug it and re-plug it in)

Touch the FIDO key when its LED light flashes

Now, you will see the prompt below:

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Touch the FIDO key again when its LED light flashes

Finally, you will see the prompt below:

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Please take note of the PIN and send it to the user.