Vulnerable effects

[crampersad]

I'm still relatively new to the product. After using FGU as a DM for the last 5 months, I've started trying to add some custom magic items.
While trying to code the effects, I'm struggling with the vulnerable condition

I have been using the following page as a reference.
https://www.fantasygrounds.com/wiki/index.php/5E_Effects#Specific_Magic_Item_Examples

So my weapon has Resist 3 Necrotic on it, and it works:
Weapon Resists; RESIST: 3 necrotic

However I want to also add Vulnerable 2 Acid to it as well
Weapon Resists; VULN: 2 Acid

That does not seem to work. However if I changed it to "Weapon Resists; VULN: 2 Piercing" (without quotes) that would work vs piercing damage
stripping every effect except VULN 2 Acid off of the PC and testing still does not change things.
What am I missing?

52807

[Lo Zeno]

[Deleted because I said an incorrect thing]

[Zacchaeus]

The damage needs to be in lower case so VULN: 2, acid.

Here's a link to the current Wiki. The one you are looking at is very old. https://fantasygroundsunity.atlassian.net/wiki/spaces/FGCP/pages/996642031/5E+Effects+for+Advanced+Automation