Some users have reported trouble signing into multiplayer services, getting the below pop-up, even on multiple retries. We are continuing to investigate this.
As a first-step in troubleshooting, please check that there are not any server maintenance outages, or Xbox Live outages, as they may cause this issue temporarily.
Next, please check your antivirus settings as described on this Support FAQ article, before consolidating reports below.
Please note that getting the above pop-up one or a few times is not necessarily an indicator of this issue; it may be this issue if it persists after several retry attempts.
Also note that issues connecting to Steam or Xbox Live services are not related to this issue.