clientconfig.passport.net  # Used for sign-ins, creating new accounts, and recovering existing Microsoft accounts on your (confirmed by Microsoft).

# Used for Xbox Live Achievements (confirmed by Microsoft).
v10.events.data.microsoft.com
v20.events.data.microsoft.com

client-s.gateway.messenger.live.com  # Used for Xbox Live Messaging.

xbox.ipv6.microsoft.com
device.auth.xboxlive.com
www.msftncsi.com
title.mgt.xboxlive.com
xsts.auth.xboxlive.com
title.auth.xboxlive.com
ctldl.windowsupdate.com
attestation.xboxlive.com
xboxexperiencesprod.experimentation.xboxlive.com
xflight.xboxlive.com
cert.mgt.xboxlive.com
xkms.xboxlive.com
def-vef.xboxlive.com
notify.xboxlive.com
help.ui.xboxlive.com
licensing.xboxlive.com
eds.xboxlive.com
www.xboxlive.com
v10.vortex-win.data.microsoft.com
settings-win.data.microsoft.com

arc.msn.com  # Required for the Store app on the Xbox Series X and Series X to function fully.

https://www.reddit.com/r/xboxone/comments/5khrrl/achievements_not_unlocking/

https://www.reddit.com/r/xboxone/comments/5l7bm1/tech_piholeother_dns_users_additional_whitelist/