Hello I am unable to play any online mode and am getting this message
attention
Error authorizing user with halo 5 guardians services.
Try hard resetting your console. This clears the cache and usually solves this issue. Hold the power hitting down until the console powers off completely. Or you can turn off the console and unplug it from power for 10 sec.
If those steps don’t do anything, try uninstalling and reinstalling Halo 5. Also try removing your profile from your console and redownloading it.