Hello @SriSaiKrishna-1911 Welcome to Microsoft Q&A community forum. Happy to answer your question!
I understand your concern about not being able to spin up VM in the mentioned regions (East US, West US 2, Southeast Asia, West Europe, and Central US) using your Azure free trial account.
FYI: Azure is available in 140+ countries/region.
However, the issue you are experiencing is because not all regions are enabled by default for Azure free trial account due to region constrains or capacity constraints.
Region constrains: Those regions which are high in demand and are available only on request basis/business requirement (Justification). These regions are enabled for Azure free trial account
Capacity constrains: These regions again are high in demand and are not available due to capacity issues. but can be enabled through support.
For your situation, I recommend you contact Azure subscription management team for region enablement by raising a support request. The ticket enables you to work closely with the support engineers and get a quick resolution to your issue.
Here is the link - https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request to create support case.
FYI: Azure Billing and Subscription Management support is included in the Basic Support Plan without any charge.
https://azure.microsoft.com/en-us/support/plans/
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