Unable to craft "Minions Deal #% Increased Damage"

Getting a "This item already has a mod of this type" error on the crafting bench when trying to craft Minions Deal #% Increased Damage? What mod on this item is blocking me from crafting?

Spell damage is my guess if it's a prefix. Even though they are technically very different mods, it's to stop people making 1h weps with like 200%+ spell or attack damage by having a good minion damage roll + spiritual aid.

i can't do it either but theres clearly wands on the market with dual dmg mods, never works for me though.

idk how they got it. will have to hope they come back online and then i can jsut straight up buy it ;)

There is a hybrid minion damage and normal minion damage roll i think
you can get both of those

Hover over the item in your stash/bag and hold down the ALT key.
You can have 3 Prefixes and 3 Suffixes.
My guess if you already have 3 of each.

It has 2 prefix and 3 suffix, and minion increased damage would be the 3rd prefix.

I just tested on a wand with spell damage, and had no trouble applying minion increased damage on top of that.

Not clear what is going on with OP's wand. Maybe convoking wands have special rules, or perhaps there is a bug?

Looks like a bug then unless minion damage is sharing mod group with something else.