People say "communication" but the basis of that is stuff like memes, sharing news, gossip. Talk to each other about non-work things and it'll be easier to talk about work things.

Scrum has been a way to force people to communicate, but absolutely don't rely on it. There's all these research that tells us that using AI for essays makes you lazy. But in the same form, if you only talk to colleagues during the enforced scrum meeting slots, the team will find it difficult to communicate.

Ask each other for life advice and all that. Get used to doing it in messages. Somehow people will only talk to their boss about pizza dough in an office but not online, but that's what the #random channel is for.