How to control GPIO?

Using jetson xavier nx, jetpack5.1.1, ubuntu20.04.
I use commands in the terminal to control the IO port to output a high level, but when I use a multimeter to measure the voltage it shows 0. What is the problem? I tested the seventh pin IO number 436 and the fortieth pin IO number 446 and there was no voltage output.

Please don’t give screenshots. Give text logs please.
You even overlapped the two images…

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