Ok this is one of those “unsure if its a bug or a feature” scenarios.
“Dropped” crafting shards can’t be gifted to MP party members.
Now if this is a feature here is the reasoning I think it should be allowed.
I am running a Sentinal and my freind i am partied up with is a Rogue. A Rogue specific crafting shard drops for me. I should be able to gift it to my friend i am playing with jsut like any “Dropped” item. Same for the “this shard will help my friend’s build and i dont need it”
Still abidiing by the whole they have to be in same zone at the time of drop for this.