iQaudio DAC+ on the Rock pi 4 Mute Issue

I am using the Rock pi 4 B+ and I have installed the iQaudio DAC+. Powering the System with 12V from the iQaudio power input. I am using Debian.

When I attempt to drive the mute pin high (PIN 15; GPIO4_C5) the pin voltage value only goes to about 1V, and it doesn’t seem sufficient enough to unmute the amplifier. When the DAC+ isn’t installed, this pin is able to get to 3.3V. Also, I have tried the same DAC+ on a raspberry pi, and I don’t have this problem.

Are there some settings for the Rock Pi’s pin other than just output?