Help with assigning a random, custom text NBT tag to the player upon player joining the world.

So I'm trying to create a mod based off of the Naruto series, and the first feature I'm trying to implement is one that randomly assigns the player to one of four clans. I thought I had the procedure set up correctly, however there seems to be an issue. So the procedure is set to trigger upon the player joining the world. After that it checks to see whether or not the player has already been assigned to a clan. If not, it generates a random number, between 1 and 4, assigns each clan to a value, and then assigns the player to a clan with a corresponding message, notifying the player which clanthey have been assigned to. However when I test this out, I do not see any message in-game upon creating and joining a world. Amy help here would be greatly appreciated. I can post the procedure set up too, I'm just not sure the right way to do that.