Using a loudspeker as a dynamic microphone on DAC+ ADC

I'm trying to use a loudspeker (8 Ohm) with DAC+ ADC to record sound. Everything is correct on the software side. But when I run:

arecord -d 5 -c 2 -f U8 smpl.mp3

I get a file with no sound at all. Could you point me to the right direction?

I'm not good at electronics, just starting...

I set the jumper as described here - https://www.hifiberry.com/build/documentation/using-dynamic-microphones-with-the-dac-adc/.

I also tried to use an amplifier based on LM3886TF for the loudspeaker, so amplified signal is a source for DAC+ ADC. That doesn't work either.

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