Halo 5 could not find a server that was suitable for all of your fireteam

Sorry to hear it. That message suggests that some members of your fireteam either do not have the required content installed or online restrictions prevent them from playing.

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

Yeah the message say

COULD NOT FIND A SERVER THAT WAS SUITABLE FOR ALL MEMBERS OF YOUR FIRE TEAM

Are you getting any sort of error code?

Do any of your other devices have issues connecting?

Games like Black Ops will give me an "error code", but it's just the alphabet. Halo 5 will say "gamemode is not suitable for all players in fireteam", for all gamemodes, even if I'm playing alone. Other games will just say I can't connect. And Xbox is the
onlyconsole this is happening on. Strangely enough, Backwards Compatible games connect and play fine.

I had this problem for months before I realised what I had done. I set up a geo filter through my modems settings specifically for my xbox to help with another game I was playing. Took me a long time to realise the times lined up when I done this and when halo stopped working. Only halo infinite though was affected stragely. Just removed my xbox from the filter list and problems is now solved. Finally.