Close, but no dice. Shadowbans are the only bans given out directly through Fates, all other bans are likely console bans. What gets you shadowbanned: Enemy Only skills, weapons/staves/items, and classes; having more than a certain number of shapshifters (Kitsunes, Wolfskins, Nohr Prince/ss, and their promotions) on your team; forged weapons that cannot be forged (includes weapons like Raijinto and the Yatos, but doesn't include the S-rank weapons which are allowed to be forged); setting the bitflags for special weapon usage or staff usage and having those items equipped; and personal skills equipped as normal skills. Shadowbans are easily circumvented by reverting whatever change caused it. Ex: You put an enemy only weapon in the inventory of a unit in your party. Fix: place that weapon in the convoy. You will then be unshadowbanned.
On the subject of dlc skills, I think that they are all now marked as released as Bold Stance does not shadowban and it is unavailable in the US (which is the region of the copy I am playing). Classes on characters that can't have them normally doesn't matter at all (even if the character is the wrong gender). The only time is does matter is if the class is enemy only or if you have too many shapeshifters. Don't know about the dlc skills before the class thing. Sounds logical that it would be a shadowbannable offense, but with the silly things that are allowed we can't go by logic. Only testing.
