You Do Need power plug adapter while traveling from Mayotte to Somaliland.

Here is Why You Need An Adapter

The outlet and plug type used in Somaliland is G and in Mayotte are C and E. This is how they look like.

Mayotte

In Mayotte, outlets of type C and E are in use.

Type C

Type E

Somaliland

In Somaliland, outlets of type G are in use.

Type G