Compendium Sharing Not Available for this Game: Current Players: 3 Max Players: 5

I created a campaign for Curse of Strahd and I was under the impression I could share my PHB with up to 5 people with the free tier.    Here is what it is saying to me.  I currently have 3 players and the compendium sharing indicates this.  Could I get some clarification? Compendium sharing is not available for this game. You don't have any available compendium sharing slots. You can remove compendium sharing by clicking on the game, below. Want to share with more players and more games?  Upgrade your subscription   Current Players: 3   Max Players: 5

Do you have another game that you are sharing compendiums with? As a free user, you can only share with one game at a time.

Ahh.  I'm sharing Curse of Strahd.  So by sharing that, I am not able to share the Player's Handbook.  I see.

No, Curse of Strahd is a module, which you create a game from; it's not a separate compendium. You share all of your compendium's when you share them with a game, but which ones are accessible in the game (and therefore which ones are functionally shared) is determined by what compendium the game is linked to (e.g. 5e, Starfinder, Pathfinder, etc). Check the compendium share interface, do you already have a game shown as having compendium sharing active? It will look like this: If you are already sharing compendium access with a game, you will see a slot like the top one there (Sa'Toriad). If you are not sharing with any games, you will see a blank slot that looks like the second slot there (reads Compendium Sharing Slot Available).

I have the Curse of Strahd module shared.

That means you have a game called Curse of Strahd  in which you are sharing your compendium. You can't share to more than one game with a free account. Here's what my sharing section looks like from the same game I showed earlier after making a Curse of Strahd game (which I named Curse of Strahd Game):

Hi, Brandon. Scott's correct. Additionally, you can unshare with your Curse of Strahd game by clicking the "X" from that same page in the new game you want to share with (so you don't have to go track down the CoS campaign in order to disable sharing). You should then be able to share the compendium with your players in the current game.