Dictionary Error with PlayfabLeaderboards

[camouflaged-penguin]

Describe the bug
The [PlayFabLeaderboardsUnity]
The Unity Debugger messages: KeyNotFoundException in the Dictionary.
What is the impact of the issue?
The Highscore is not commited to the leaderboard

To Reproduce
Follow the Step by Step Readme.
Upload the json script to Revision on playfab.
Start the Scene in Unity.
Try to write down a score.
Try to submit the score. The error occurs.

Expected behavior
I expected the score to be submitted.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• Windows
• Firefox