DAC + DSP Can't get Sigma running on Ubuntu

I've installed the DAC + DSP on a Pi 4B board running Ubuntu 22.04.3 raspi.

When trying to start SIgma TCP server I get the following errors
ALSA lib confmisc.c:165:(snd_config_get_card) Cannot get card index for 1
ERROR:root:ALSA mixer DSPVolume not found
ERROR:root:can't create mixer control - aborting
This occurs in the systemd logs and when I run directly run Sigma
/usr/local/bin/sigmatcpserver --alsa

I followed these instructions for installing the board drivers:  https://www.hifiberry.com/docs/software/configuring-linux-3-18-x/
The location for firmware config on Ubuntu is `/boot/firmware/config.txt`, but otherwise everything went smoothly.
Output from aplay -l:
aplay -l 
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberrydacplusdsp_sou], device 0: Hifiberry DAC+DSP SoundCard HiFi dacplusdsp-codec-0 [Hifiberry DAC+DSP SoundCard HiFi dacplusdsp-codec-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

I then followed the instructions for installing the DSP toolkit (including enabling SPI)

I also tested that there is actually output from RCA.

Any help would be appreciated.

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