• Verify that a slot is available in your Hub.
    • If there are none available, try upgrading the Hub to unlock more slots.
  • Verify that you have the Coins required to assign that Vehicle to an empty slot. This Coin cost is visible at the bottom of a Vehicle card.
  • Verify that you have not reached the Assignment Limit for this Vehicle card. This is visible as a counter at the top right of a card (example: 1/2).
  • If this is maxed out, try upgrading the card to increase this limit - some upgrade levels increase it!