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@Gordon
Hi,
It sounds like what you're doing is fine - as @Robin says it'd be great if you could measure the voltage across GND and 3.3v (and also VBAT, just to make sure).
Do you get anything from the Pico at all when you apply the 9v? Like a flash of the red LED?
Did you solder the pins on the Pico yourself? so is it possible there might be a short on the board somewhere from doing that (or possibly a bad connection)?