I choose the program set amplitude to 20V Inverse +Sync then tick Reduce Amplitude 10kHz but then I only get 0.6v or 0.45v 0.84v readings.

Spooky2 is reducing the amplitude at frequencies below 10KHz, as you are telling it to.

So, either uncheck the "Reduce Amplitude < 10KHz" option (and don't touch the electrodes), or pick a frequency above 10KHz and repeat your test. Above 10KHz you should see the amplitude at 20V. Then you'll know it's working as intended.
In short, it seems you are doing nothing wrong; it's only your expectations that need adjustment.

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