I'm new to DDB homebrew, and I'm trying to create a piece of armor that adds your CON modifier to the AC. The most help I see talks about unarmored AC, and that's not what I'm looking for. Any help is appreciated https://routerlogin.uno/.

You add a modifier, set the modifier type to "Bonus", the modifier subtype to "Armour Class", then set the Ability Modifier to "Con". It will add your Condition Modifier to your AC.

It's probably best you ask these questions in the Homebrew section, you're more likely to get answers, and quicker, there.

I would instead use the “Armored Armor Class” subtype.

IAmSposta probably knows better. I understand just went with the intuitive method. I'm not sure what the difference would be.

If the “Armor Class” subtype is used it might apply the bonus even if the armor is not being used. (It pro’ly shouldn’t happen, but who knows with this system? 🤷‍♂️) The “Armored Armor Class” subtype will only work when armor is being worn.