Final answer:
Coca-Cola is not available through authorized channels in Cuba and North Korea due to trade embargoes and political isolation.
Step-by-step explanation:
The two countries where Coca-Cola is not available through authorized channels are Cuba and North Korea. Coca-Cola's unavailability in these countries is attributed to long-standing trade embargoes and the political isolation of these nations. Coca-Cola is a prominent symbol of globalization, and while it is widely accessible around the globe, these exceptions highlight the ongoing political and economic barriers that exist in international trade.