Add a board you have in hand: bench names it, makes it yours, and gives you the two lines its settings.toml needs. Then open it here to set it up.
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A board you have in hand. Pick what it is and name it; bench makes it yours.
Copy these now. bench shows the secret this once and does not keep it. If it is lost, remove the device and add it again.
bench's broker is not set up yet. The lines are good: the board keeps trying and connects once it is.
Open the board's CIRCUITPY drive, put these lines in settings.toml beside its Wi-Fi lines, and save. The board restarts and finds bench.