Hello Explorers!
Pokémon GO has ended support for 32-bit Android devices, so Trainers on these devices can no longer make nominations from within the game. Trainers using affected devices will also no longer be able to play Pokémon GO.
To continue playing and enjoying nomination capabilities, Trainers who are still using 32-bit Android devices can upgrade their devices to regain access. There are no changes to which OS versions are supported.
Learn more about this change and the reasons for it here: Discontinued Support for 32-Bit Android Devices — Pokémon GO Help Center