At the moment, IVS only support 2 audio channels (either stereo or mono). For more details refer the link below.
You may explore AWS Elemental Media Live for such use-cases.
No (Audio) Device Output / remote audio onlyasked 2 years ago
IVS: Disable AudioAccepted Answerasked 4 months ago
AWS MediaConvert - Job for multiple audio-only streamasked 4 months ago
IVS support for audio rendition groupsAccepted Answerasked 7 months ago
Regarding AWS Element Live Audio outputasked 5 months ago
Creating our own codec for streaming audio on AWSasked 3 months ago
is IVS trailing pathname is fixed?asked a year ago
Does IVS support rewinding?Accepted Answerasked 9 days ago
Input stitchin with one audio track for all videoAccepted Answerasked a year ago
IVS player quality of streaming 1080 is poorAccepted Answerasked 6 months ago