As Ripcord does not directly support enterprise grids yet, I had to add all my corporate workspaces into it separately.

Here comes the problem: when I get a direct message or a message in a shared channel, I get notifications about it for each workspace that I connected. And when in reality I received, say, 1 message from 1 user, I get, say, 8 notifications for each message.

That's interesting! I have no way to test with enterprise grids like that, though. I'm not sure what to do about it.

Could you think of a workaround, i.e., an option to suppress notifications that are identical in everything but team_id?

Yes :) Fixed in next version