Gym defence, The gym is under attack! Try again later

It's a bug and it's known by Niantic.

Well at least it's a bug when you just tore down that enemy gym and everyone in the group tries to assign defenders.

There are two ways to get around the problem:

• Sync your assigning so that everyone push the button simultaneously
• Manually turn your clock (the one on your phone) ten minutes forward. You'll have to find out how to do so on your specific phone.

When the gym is actually under attack this isn't a bug. As of now there are different reports on wether the message (and the disabling of assignments) occurs when the gym is attacked or if it occurs when a defender is kicked out.

In the latter case it makes perfect sense, or you could just camp a friendly gym and reinsert a pokemon as soon as one got kicked out.

Add that it makes shaving a major pain in the arse, which is a good thing in my book.

In the former case, well that would just be either a bug or a horrid implementation. Anyone could permanently lock a gym down by 'touching' a defender every nine minutes or so. I don't even want to have nightmares about bots doing this.