Badges can only be rewarded in Space packages, not in Space Templates. Check out the explanation of the difference between spaces and space templates here:

Spaces & Space Templates

Badges can be shared across multiple spaces if they are created from the same Unity Project.

Rewarding badges

As noted before, badges are rewarded when a user completes a quest. You can add a badge to the Quest Rewards property on any quest. Select the type Badge and pick the badge you want to reward from the dropdown.

Spatial Creator Toolkit<br />