I am running the Hifiberry DAC+ADC on a Pi 4 with the WaveInput plugin.
In difference to your case, I do not use the analog output. Only the analog input and HDMI for digital audio output isin use.
To get WaveInput running, you need to know the correct soundcard and channel of the audio input of the ADC.
On my installation I entered wavin:plughw:1,0 as favorite and it runs correctly.