Why did Myanmar get removed from the list of countries on the international driving permit issued by the American Automobile Association (AAA)?
Myanmar used to be in 2016-issued international driving permits but it's not on international driving permits currently issued (2019-10-14).
Here is the list of countries in international driving permits currently issued (2019-10-14):
Here is the list of countries in international driving permits issued in 2016: Myanmar is present in the list.
According to the first page of the international driving permit this is the list of the "contracting States:
The AAA online application form for the international driving permit still mentions Myanmar: https://web.archive.org/web/20191015015350/https://www.aaa.com/vacation/application2a.pdf