You Do Need power plug adapter while traveling from Réunion to Micronesia.

Here is Why You Need An Adapter

The outlet and plug type used in Micronesia are A and B and in Réunion are C and E. This is how they look like.

Réunion

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

Type C

Type E

Micronesia

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

Type A

Type B