I didn't find any related threads so far, apologies if I missed it (I did use the search).
I'm finally able to try and start the game after installing the Xbox and Xbox companion apps from the Windows Store.
However, now the game tells me:
"Change your settings to play
You can't play with content created by other players because of how your account is set up. Go to your privacy & online safety settings on Xbox.com to change this."
Of course it doesn't, let's say, give you a direct link. But I logged into my Microsoft Account and Xbox.com and changed my privacy settings to their most permissive. And yet the game still won't start.
What specifically does the setting it wants changed looks like? God forbid they show an example.
If this is the page it's referring to:
I allowed it all so I'm unsure what else to do.