Failure to create Azure Firewall."Microsoft.Network/publicIPAddresses" can not be used in Southeast Asia

Hi, All.

I Failed to create Azure Firewall."Microsoft.Network/publicIPAddresses …" can not be used in Southeast Asia. but, southeastasia is included in the list of available regions.

Notes.

- I have multiple Azure Subscription

- Visual Studio Enterprise(MSN) , Visual Studio Enterprise, ...

- The preview function was activated according to "https://docs.microsoft.com/ja-jp/azure/firewall/public-preview ".

- But, I have multiple subscription. I activated preview function on each some subscription(not all) using Select-AzureRmSubscription

- Exists ResourceGroup has a VirtualNetwork

- I made AzureFirewallSubnet in that VirtualNetwork.

- I tried to create Firewall on Firewall(Preview) tabs in VirtualNetwork 

- On Wizard, I select activated subscription, exists ResoureceGroup, exists VirtualNetwork, and new one Public IP address.

Review Process shows `"Microsoft.Network/publicIPAddresses …" can not be used in Southeast Asia. ...`

I keep the activity log in JSON format.
If you need it, I can offer it.