Discord offers age verification via AgeKey [1]. Reading their privacy policy, one can create multiple AgeKeys based on the same identification or face scan. Each AgeKey is stored as a passkey and not persisted anywhere else. The privacy policy indicates that the identification information is submitted to 3rd party providers, and also appears to be used for general internet company marketing and promotions, similarly invasive to buying a pair of shoes online. That is, your identity will be propagated to ad networks by AgeKey as it similarly does for ecommerce.
Discord cannot determine identity from the AgeKey.