Currently trying to set up my first campaign, and one of my players wants to play a halfling with the dragonmark of hospitality. He's chosen Warlock as his base class, and taken the appropriate subrace. He cannot select any of the spells from his dragonmark (Goodberry, etc.), as they do not show up as options. I've tried it with wizards as well as levelling up the character, and the spells don't seem to populate. Anything we're doing wrong? Is there another way to do this?