I don’t understand what you mean, why would coordinating across a large group be against the agile principles? It sounds like the main issue here is lack of communication and planning which are both important parts of any process including one based on agile.

Planning becomes more important for a larger project but if you hyper focus on sticking to the plan even if things change you can end up delivering something that is not useful for your customers, so I think the principles still make sense there.