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

Here is Why You Need An Adapter

The outlet and plug type used in Palau are A and B 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

Palau

In Palau, outlets of type A and B are in use.

Type A

Type B