Why can't I log in using my Pokémon Trainer Club or Nintendo account? — Niantic Profile Help Center

The Pokémon Trainer Club and Nintendo Account login methods are not currently supported. The best way to claim your Niantic ID is to link your

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If people can use the same Pokemon Go account on two devices, but I can't, is it a device issue? - Quora

Get a Super Incubator and 1,000 Stardust when you link and validate your Pokémon Trainer Club account – Pokémon GO

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Niantic Support says the Pokemon Trainer Club login issue has been fixed. : r/TheSilphRoad

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