Pokémon Go: How to fix 'The Gym is under attack! Try again later' errorHow do you fix the 'The Gym is under attack! Try again later' bug in Pokémon Go? By turning up the clock!
Pokémon Go is currently experiencing a bug where the game incorrectly throws up an error for people trying to add their Pokémon to a freshly claimed Gym. Basically, one person can go in fine, but anyone and everyone else has to wait 10 minutes before they can add their Pokémon and help defend the Gym.
It's super frustrating to players who attack Gyms in groups. Pokémon Go developer Niantic says the bug is know and the company is working on the fix. In the meantime, here's a fix you can apply right now!
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TL;DR: How do you fix it?
Have everyone put their Pokémon on all at the same time.
Or, if you miss it, manually your phone clock 10...
Source:
Pokémon Go: How to fix 'The Gym is under attack! Try again later' error
