I've noticed that only 3 of the 7 players in my campaign seem to have their rolls showing up in our Game Log.

Is there something that needs to be toggled on/off by either the DM or the Players?

I think you need to enable the dice rolling option. That was my issue anyway.

Each of the players would have to turn on their Dice Rolling for it to show up in the log.

Nope, that's not it.  We've checked, and each and every character has Digital Dice Rolling turned on already. 

Same here. As a player in one campaign I can see several dice roles but not all of them and never my own.

Settings (enable digital dice role) for all characters are identical. In another campaign where I am the DM I can also only see 2 out of 3 players roles.

Might be an issue with Beyond20+Roll20 which is our setup for every campaign.

edit: when I'm just rolling for fun, to check if the log works and without Roll20 open, it does not work at all for me.

Third party extensions are unsupported by D&D Beyond and as such, may cause unexpected behaviour with things such as the game log. I'd recommend disabling any such extensions if you want to ensure the game log functions correctly

Thanks for the reply.

Seems to be something different. I checked the charcter settings in my standard browser (Edge-Chromium based) and digital dice rolling was enabled. Then I checked the same character with Chrome (basically same Browser engine) and there digital dice was disabled. I enabled it in Chrome, saved the profile and now it works. 

Beyond20 works totally fine, because you can decide where to click and thus your action defines, which script gets triggered.

Caondlution: mabe you need to check with another browser, because your main browser doesn't show/save the real setting for digital dice rolling.

Not sure if anyone will find this helpful, but in case it does:

We use D&DBeyond and Discord in my campaign, with the Beyond20 extension. (No VTT, we use Owlbear Rodeo)

I've found that both D&DBeyond's Dice Rolling (found in Preferences) must be enabled and the Beyond20's option, "Use D&D Beyond's Digital Dice" must be enabled for the rolls to show up in D&DBeyond's Game Log.

I like the option as DM in a campaign to show dice rolls to Everyone or only Self, but is there a way to change the default on this? Starting an encounter, the game log always starts on Self, so unless I remember to change it each time, my players don't see my dice rolls. Not a big issue, but it would be nice to be able to change it once and have that "stick" until I choose to change it again.