You Do Need power plug adapter while traveling from Azerbaijan to Cocos (Keeling) Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Cocos (Keeling) Islands is I and in Azerbaijan are C and F. This is how they look like.

Azerbaijan

In Azerbaijan, outlets of type C and F are in use.

Type C

Type F

Cocos (Keeling) Islands

In Cocos (Keeling) Islands, outlets of type I are in use.

Type I