myTrailhead Badges Count and Summary do not Show on Standard User Profile

This issue occurs when the Trail Tracker app or package is installed using the "Install for Admins Only" option. In order to resolve the issue, provide access to the Trailheadapp Apex classes for the affected user profiles.
Steps to resolve:

1. Navigate to Setup.
2. Go to the Affected Profile.
3. Select Enabled Apex Class Access.
4. Click Edit.
5. Add the Apex class "Trailheadapp badges components controller."
6. Click Save.

If affected user profiles do not have appropriate access to the Apex Classes or controller for the Lightning Components (UserBadgeCount or UserBadgeList), they will not see Badges Earned or Counts.