This problem is identical to the one you get when you're in the office. If you have a conversation with someone that impacts the group, you need to either a) have that conversation in a public channel (like a team slack channel) and/or b) need to provide a set of notes from the 'meeting' to your team.

If you're used to being able to just tap people on the shoulder and get a group of people looking at something, you can still do that, just get everyone on a call. Working remote, those "collaboration" sessions start to look more like "interruptions", for better or worse. If your team doesn't have more robust communications strategies than being in earshot of each other, it's going to show.