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To answer it is southeast Asia region in Azure
To check if ARM-based VMs are available in the Singapore region or any other specific region in Microsoft Azure, you can follow these steps:
Visit the Azure Portal: Go to the Azure Portal at https://portal.azure.com/.
Sign in: Sign in with your Azure account credentials.
Create a New Virtual Machine: You can create a new virtual machine by clicking on "Create a resource" and then selecting "Virtual machine" under the "Compute" section. Alternatively, you can navigate to an existing virtual machine.
Configure VM: When configuring the virtual machine, you'll reach a step where you need to choose the virtual machine type or size. This is where you can check for the availability of ARM-based VMs.
Select Region: Choose the region for your virtual machine deployment. This is where you can see the available VM sizes/types for that region.
Browse VM Sizes: Click on the "View all" or "See all" link next to the VM size/type selection. This will display a list of all available VM sizes/types for the selected region.
Filter by Processor Architecture: Within the list of available VM sizes/types, you may find an option to filter by processor architecture, which could include ARM-based options.
Please check below Image , it will help you , please accept answer , if it helps , Thanks