The issue is visible in the log. The default audio device returned by kodi is "Default" but when trying to set the value again it is interpreted as "PULSE:Default".
Your alsa devices are:
2022-07-08 18:11:15.669 T:984 INFO <general>: Enumerated ALSA devices:
2022-07-08 18:11:15.669 T:984 INFO <general>: Device 1
2022-07-08 18:11:15.670 T:984 INFO <general>: m_deviceName : @
2022-07-08 18:11:15.670 T:984 INFO <general>: m_displayName : Default (vc4-hdmi MAI PCM i2s-hifi-0) ()
2022-07-08 18:11:15.670 T:984 INFO <general>: m_displayNameExtra:
2022-07-08 18:11:15.670 T:984 INFO <general>: m_deviceType : AE_DEVTYPE_PCM
2022-07-08 18:11:15.670 T:984 INFO <general>: m_channels : FL, FR
2022-07-08 18:11:15.670 T:984 INFO <general>: m_sampleRates : 32000,44100,48000,96000
2022-07-08 18:11:15.670 T:984 INFO <general>: m_dataFormats : AE_FMT_S24NE3,AE_FMT_S24NE4,AE_FMT_S32NE,AE_FMT_S16NE,AE_FMT_S16LE,AE_FMT_S16BE
2022-07-08 18:11:15.670 T:984 INFO <general>: m_streamTypes : No passthrough capabilities
2022-07-08 18:11:15.670 T:984 INFO <general>: Device 2
2022-07-08 18:11:15.670 T:984 INFO <general>: m_deviceName : sysdefault
2022-07-08 18:11:15.670 T:984 INFO <general>: m_displayName : vc4-hdmi ()
2022-07-08 18:11:15.670 T:984 INFO <general>: m_displayNameExtra: MAI PCM i2s-hifi-0
2022-07-08 18:11:15.670 T:984 INFO <general>: m_deviceType : AE_DEVTYPE_PCM
2022-07-08 18:11:15.670 T:984 INFO <general>: m_channels : FL, FR
2022-07-08 18:11:15.670 T:984 INFO <general>: m_sampleRates : 32000,44100,48000,96000
2022-07-08 18:11:15.670 T:984 INFO <general>: m_dataFormats : AE_FMT_S24NE3,AE_FMT_S24NE4,AE_FMT_S32NE,AE_FMT_S16NE,AE_FMT_S16LE,AE_FMT_S16BE
2022-07-08 18:11:15.670 T:984 INFO <general>: m_streamTypes : No passthrough capabilities
2022-07-08 18:11:15.670 T:984 INFO <general>: Device 3
2022-07-08 18:11:15.670 T:984 INFO <general>: m_deviceName : sysdefault:CARD=vc4hdmi
2022-07-08 18:11:15.670 T:984 INFO <general>: m_displayName : vc4-hdmi (vc4hdmi)
2022-07-08 18:11:15.670 T:984 INFO <general>: m_displayNameExtra: MAI PCM i2s-hifi-0
2022-07-08 18:11:15.670 T:984 INFO <general>: m_deviceType : AE_DEVTYPE_PCM
2022-07-08 18:11:15.670 T:984 INFO <general>: m_channels : FL, FR
2022-07-08 18:11:15.670 T:984 INFO <general>: m_sampleRates : 32000,44100,48000,96000
2022-07-08 18:11:15.670 T:984 INFO <general>: m_dataFormats : AE_FMT_S24NE3,AE_FMT_S24NE4,AE_FMT_S32NE,AE_FMT_S16NE,AE_FMT_S16LE,AE_FMT_S16BE
2022-07-08 18:11:15.670 T:984 INFO <general>: m_streamTypes : No passthrough capabilities
2022-07-08 18:11:15.670 T:984 INFO <general>: Device 4
2022-07-08 18:11:15.670 T:984 INFO <general>: m_deviceName : hdmi:CARD=vc4hdmi,DEV=0
2022-07-08 18:11:15.670 T:984 INFO <general>: m_displayName : vc4-hdmi (vc4hdmi)
2022-07-08 18:11:15.670 T:984 INFO <general>: m_displayNameExtra: ACI ASUS VP247 on HDMI
2022-07-08 18:11:15.670 T:984 INFO <general>: m_deviceType : AE_DEVTYPE_HDMI
2022-07-08 18:11:15.670 T:984 INFO <general>: m_channels : FL, FR
2022-07-08 18:11:15.670 T:984 INFO <general>: m_sampleRates : 32000,44100,48000,96000
2022-07-08 18:11:15.670 T:984 INFO <general>: m_dataFormats : AE_FMT_RAW,AE_FMT_S24NE3,AE_FMT_S24NE4,AE_FMT_S32NE,AE_FMT_S16NE,AE_FMT_S16LE,AE_FMT_S16BE,AE_FMT_U8,AE_FMT_RAW
2022-07-08 18:11:15.670 T:984 INFO <general>: m_streamTypes : STREAM_TYPE_AC3,STREAM_TYPE_DTSHD,STREAM_TYPE_DTSHD_MA,STREAM_TYPE_DTSHD_CORE,STREAM_TYPE_DTS_1024,STREAM_TYPE_DTS_2048,STREAM_TYPE_DTS_512,STREAM_TYPE_EAC3,STREAM_TYPE_TRUEHD
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To avoid any guessing try all possible devices:
- "ALSA:@" (already tested by you with failure)
- "ALSA:sysdefault"
- "ALSA:sysdefault:CARD=vc4hdmi"
- "ALSA:hdmi:CARD=vc4hdmi,DEV=0"