I've done both the automatic and manual setup procedures. I've removed and reseated the module several times. However, my board still isn't listed when I issue:
aplay -l
aplay: device_list:270: no soundcards found...
This is from dmesg:
[    4.254711] audioinjector-stereo soc

 ASoC: CODEC DAI wm8731-hifi not registered - will retry
[    4.254731] audioinjector-stereo soc

 snd_soc_register_card failed (-517)
[    4.479077] audioinjector-stereo soc

 ASoC: CODEC DAI wm8731-hifi not registered - will retry
[    4.479096] audioinjector-stereo soc

 snd_soc_register_card failed (-517)
[    4.480112] brcmfmac: F1 signature read @0x18000000=0x15264345
[    4.486464] wm8731 1-001a: Assuming static MCLK
[    4.486491] wm8731 1-001a: 1-001a supply AVDD not found, using dummy regulator
[    4.486560] wm8731 1-001a: 1-001a supply HPVDD not found, using dummy regulator
[    4.486611] wm8731 1-001a: 1-001a supply DCVDD not found, using dummy regulator
[    4.486663] wm8731 1-001a: 1-001a supply DBVDD not found, using dummy regulator
[    4.487042] wm8731 1-001a: Failed to issue reset: -121
[    4.487101] brcmfmac: brcmf_fw_map_chip_to_name: using brcm/brcmfmac43455-sdio.bin for chip 0x004345(17221) rev 0x000006
[    4.487544] wm8731: probe of 1-001a failed with error -121
[    4.487731] usbcore: registered new interface driver brcmfmac
[    4.488007] audioinjector-stereo soc

 ASoC: CODEC DAI wm8731-hifi not registered - will retry
[    4.488019] audioinjector-stereo soc

 snd_soc_register_card failed (-517)
I'm running the Raspberry Pi 3B+, Linux version 4.14.62-v7+ (dc4@dc4-XPS13-9333) (gcc version 4.9.3 (crosstool-NG crosstool-ng-1.22.0-88-g8460611)) #1134 SMP Tue Aug 14 17:10:10 BST 2018. Did I receive a defective module?
Thanks