The player instructed that the facility to don or doff armor as an action can be a magical property of Arcane Armor which supersedes the normal time requirements. The DM permitted the warforged artificer to remove the Arcane Armor being an action, and later on spelled out the ruling on https://aarakocra-dnd70246.dreamyblogs.com/28445867/helping-the-others-realize-the-advantages-of-eberron-d-d