I play Barbarian with the IK-HotA build, When i equip two 1-handed weapons with empty sockets and socket both with 1 shard each it works. I can use 2 soul shards.
But if you unequip one of the shard socketed weapons you can’t re-equip it. It gives the message:
“You can’t equip more than one weapon socketed with a soul shard”.
I remove one soul shard then i can use the weapon, but if i equip the un-socketed weapon first and then socket it with a soul shard i can use the 2 soul shards again.