Some Mac users are having trouble signing into iMessage and FaceTime after installing the latest OS X 10.11.4 update that was rolled out this week. Apple is said to be aware of the issue and investigating a fix.
The problem occurs soon after signing in following the installation of OS X 10.11.4. Users are asked to log back in to iMessage and FaceTime to authenticate them, but according to MacRumors, a "growing number" are unable to do so.
"The majority of the complaints are coming from users who did a fresh install of OS X, requiring them to log into the FaceTime and iMessage services," the site reports. "When attempting to sign in, an error pops up or nothing happens after entering an Apple ID and password, as seen in the video below."
Upon signing in, users see the message "Could not sign in. Please check your network and try again." Another message reads, "An error occurred during authentication."
The issue has been reported on the Apple Support Communities forum, and according to some users, Apple is already aware of the problem and working on a fix. For now, however, it seems there is no way around the problem.
All we can do, then, is wait for Apple to provide a workaround or rollout a fix. If you've run into this issue and found a solution, be sure to let us know about it down in the comments.