It seem to be similar to the workshop coding where you have to fill the initial investment first. I read something about the code at one time and now I cannot find the link. At any rate, check your clan tab to ensure the caravan is still moving, not captured. If it is good, give it a week or so. Also, they do make money.
MCM supports three setting types - Global, PerCampaign and PerSave. Global are shared across characters and saves, PerCampaign are persistent within a single campaign, PerSave are stored within the save file! It provides 5 types of options: Bool. Int Slider / Textbox. wL1J.