The player instructed that the power to don or doff armor being an action is usually a magical home of Arcane Armor which supersedes the conventional time requirements. The DM allowed the warforged artificer to remove the Arcane Armor being an action, and later discussed the ruling on the following https://simonavpmf.activosblog.com/27574484/5-essential-elements-for-half-orc-fighter-dnd