Hey folks, its tiring to answer 10 folks 10 times in 2 pages of comments with the same answers to the same questions, so for your sake and mine i have made this post so you can maybe find your question here instead :).

That is because this mod is not an unlocker, in order to unlock the faction you need to use Lokerian's Modular Faction unlocker and check the FAQ there for further help.

The Bretonnian units are recruited from resource specific building chain.

• For Bretonnian Infantry you will need Pastures Resource
  
• Where for Trebuchets you will need Timber resource.

The Red Duke is a character added in the latest DLC, and as such you will need to Wood Elves DLC to recruit him agains after his death.

First off i know you said the mod is working, but is it? make sure that the red duke has 3 legendary items in his skill tree if yes, thats a comfirmation that the mod is working, from here, make sure you have no mods that alter:

Building_units_allowed (Used for recruiting new units all custom units mod have this) - Mods with this table can be used with this mod but the maker of the mod has to change the default unique unit ID of those units recruits, any experienced unit creator will do this, but checking unit mods for conflict is a good start.

Factions - Table, Used for changing faction specific settings & UI skins for a faction, mods that alter this table and include mousillon with it, are 100% to conflict with this mod, a good exanoke us UI mods & Unlockers (My Modular Unlocker is obviously compatible with this)

The Duke's Helm Removal is done by the City of the Damned Mod, not by this one, therefor if you would like to ask for a reskin or whatever you may have better luck there, personally i love its current look.

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Hope the above helps and lowers the ammount of questions.