Finding the UUID for a player allows you to reference the player in other applications, generate the embed code or find a thumbnail for the player.
To find the UUID of a player, you can check player settings, use the embed code or the sharing page URL of the player to extract the value. For example:
In the player settings:
Here is the embed code for a player:
Here is the sharing page URL for the same player:
In both cases the UUID for this player is IDPoF0TLlWDkfsHpoLOkSA.