I got Sword, he got Shield. We are sitting next to ech other on same couch, connected to same WiFi. We got online subscriptions active. Dynamax fight works both in Local Connection and in Internet mode. We can join each other without problems. Random people from other side of globe can join our trades. We see each other trade broadcasts.
And yet, we can't trade with each other. "Link Trade" button is grayed out.
How in tarnation are we supposed to trade?