Hi Wang,
Azure Public Cloud and Azure China share the same logic on this matter. As such, the observations should be consistent across both platforms. As you may test again, please consider the following:
- Outbound IPs are omitted by-design for internal ACA because NAT gateway/egress appliance is to be used
- Azure China supports Workload profile only but not Consumption.
- Consumption profile on Azure Public Cloud will show outbound IPs because NAT gateway/egress appliance is not supported.
Please "Accept Answer" if the answer is helpful so that others in the community may benefit from your experience.