Thanks for your question! I would recommend trying the phone number on the FAQ for Azure Free Accounts. https://azure.microsoft.com/en-us/free/free-account-faq/
What if I still have questions? (About the free Azure account?)
While Azure is not yet available for Myanmar, many of the neighboring countries are supported and the support team at the above phone number may have a suggestion for your scenario. We place a high priority on geographic expansion to enable higher performance and are adding more countries as we can. There are some third party providers which front the Azure Subscriptions for organizations in unsupported countries, though I can't officially recommend these vendors since they are not from Microsoft and I can't vouch for their services.
Hope this helps!