Gospel Library Whitelist

I have a question I was hoping someone here could help me with. On my home router I've set up Internet access restrictions for my children. I have the ability to do url whitelisting, and by whitelisting lds.org and ldscn.org my kids are able to access the church website and download gospel library content without my having to lift their restrictions. But Gospel Library still fails to sync their annotations. Does anyone know what url or ip address I would need to whitelist to allow the sync to complete?

Are you whitelisting all subdomains of LDS.org and LDSCDN.org (*.lds.org, *.ldscdn.org), as well as with or without www?

Yes, any subdomains should be allowed as well. Just in case though, I tried explicitly adding ident.lds.org and ldsaccount.lds.org but the sync still failed. Only the sync though, downloading new content seems to work fine.