Did you fully set up sharing? The first time I did it, I didn't actually get it all corect. Without launching the game, go to the game page and select Game Settings, and Content Sharing within that. Make sure you have the correct compendium selected for sharing. You then need to click "yes" to the share my compendium with others, and make sure the content you own or have free access to has a checkmark on it (should be the default), which makes it turn green on the list. Save that and look at setting again to make sure the game shows up in the list just below the "share with others" question. Roll20 has also been having compendium issues of late, but its workind fine as I write this. In a dual-sheet game (I see you have 5E, which is dual sheet) you may also want to select which compendium to use. This is done in-game on the My Settings tab of the right sidebar, under Character Sheet settings (and it's apparently per-player, so your players have to set it the way they want, or you have to tell them which to pick). I don't know if this is required (I have one set in my usual game, and have had it this was for a long time).