The 400 code error due to a failure to parse inventory data from the CK API error is due to a parser being unable to call data from inventory. This is because the inventory sync is enabled on the device, but in the device group, there’s no inventory selection to sync.
To correct this there are two possible solutions either:
disable the inventory sync
(this image displays where to locate in sync management the inventory sync)
or
select at least one warehouse to sync.
(this image displays where to select warehouses to sync from device group)
This can be located within the device group under inventory configuration.
Once corrected sync your device.