Osmotic communication in virtual work environment

Ask your team how they feel it could be addressed.  After all, they are the ones that had the communication and are now missing it.  Since they know what communication was occurring, they can identify ways of recreating it in a virtual space.  There are a number of tools available for virtual communication with some being text based (Slack, Microsoft Teams) and others being video (Slack, Microsoft Teams, Zoom, Google Meet).  All of my teams have pretty seamlessly shifted to using those solutions to accomodate their needs.

I like to understand how we address the Osmotic communication when team is not sitting closely which is another usual now 

How much "osmotic communication" really happened when team members were co-located?

A student who sleeps with a textbook under his pillow will not receive any knowledge by osmosis. Physical proximity is not enough. You have to work at it. So, what do your team members actually do to facilitate communication, whether it be by "osmosis" or otherwise? What activities are involved?

How much communication takes place in public channels? For instance, are private groups and direct messages used in chat tools? Are people conscious about what is being discussed in one-on-one, team and organizational meetings?

Are concerns and decisions proactively communicated? Are they at least visible to others, and do those others know where to find them if they're interested?

I think osmotic communication is just one way for a flow of contextual information. Don't focus on osmotic communication, focus on problem and find other ways to solve them!