Units received as a Reward for Quests and Tournaments are sent directly to the Catacombs. This occurs as soon as the Reward is claimed.
If these Units do not arrive in the Catacombs as planned, you should restart the game and try again.
If this does not resolve the issue, please contact the Support Team. In your correspondence, you should specify the exact time and date when the Reward was claimed, alongside a list of missing Units.