You Do Need power plug adapter while traveling from Azores to Namibia.

Here is Why You Need An Adapter

The outlet and plug type used in Namibia are D and M and in Azores are B, C and F. This is how they look like.

Azores

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

Type B

Type C

Type F

Namibia

In Namibia, outlets of type D and M are in use.

Type D

Type M