How to find out if HX711(amplifier and 24-bit ADC) is damaged or not?
Looking closely at the photo of your setup I can see that you haven't soldered the header to the breakout board. Whilst there are headers available that don't require soldering, and ways of making header connections that don't require soldering, this isn't either of those.
Without solder the connection to the board will be intermittent at best and non-existent in general.