A Peruvian guy is flying from Paris to Mayotte (a French overseas department) on a direct Air Austral flight. He is visa-exempt for mainland France, but not for Mayotte.
When I flew from Paris to Guadeloupe and Réunion (also French overseas departments) Guadeloupean and Réunionnais immigration was unstaffed on arrival, meaning those in need of an entry stamp had no way of getting it. When exiting, however, checks took place.
Does it work the same when flying into Mayotte from Paris? If so, how can an entry stamp be obtained? Is one even needed, or will the mainland French exit stamp suffice?