Attention. At least one player in your fireteam is banned from playing Halo 5: Guardians.

If you are banned this message will appear "At least one player in your fireteam is banned from playing Halo 5: Guardians"

This error occurs if one or more players in your fireteam (including yourself) is currently banned from playing Halo 5: Guardians. Players can receive bans automatically by leaving games in-progress, killing allied players, and more. Players with bans should
wait and retry at a later time when their ban has been cleared.

If you have been banned by 343 Industries, you'll see a message when you launch Halo 5: Guardians indicating that there is an enforcement in place. You can also check if there are any Xbox enforcements against your account by signing in at the Xbox Policy
& Enforcement site:

http://enforcement.xbox.com/

Greetings,

This error occurs if one or more players in your fireteam (including yourself) is currently banned from playing Halo 5: Guardians. Players can receive bans automatically by leaving games in-progress, killing allied players, and more. Players with bans should
wait and retry at a later time when their ban has been cleared.

If you have been banned by 343 Industries, you'll see a message when you launch Halo 5: Guardians indicating that there is an enforcement in place.

You can also check if there are any Xbox enforcements against your account by signing in here: Xbox Live Enforcement

Hope this helps. Have a great day ahead.

Hi there,

I don't believe it's due to a lack of players, but it's finding players and there is no dedicated server found that meets the network requirements for the fireteam, see below:

Attention. Could not find a server that was suitable for all members of your fireteam.

This error means that no dedicated servers could be found that meet the network requirements of your entire fireteam. This might occur if you play with geographically dispersed friends. If you encounter this error while playing with friends in the same region,
restart the game and try again.

From here:
support.xbox.com/.../halo-5-guardians-multiplayer-troubleshoot

You might want to make a thread over at the waypoint forums and see if others who have had the same issue have a fix for it:
www.halowaypoint.com/en-us

I Love HALO 5 Guardians On Xbox One With Xbox Live Jump In On Xbox Live Play together and Have fun On HALO 5 Guardians On Xbox Live

Hello Rod-Noga12,

When it comes to Halo 3, Reach or Halo 4 there might be a small player base, but I have seen more people playing online with Halo 5 Guardians. Than any other halo series as of late but even with Halo 5 I only have seen
a handful of players actually playing that game as well.