Messenger For Mac Mojave

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Messenger For Mac Video

Check compatibility

You can upgrade to macOS Mojave from OS X Mountain Lion or later on any of the following Mac models. Your Mac also needs at least 2GB of memory and 12.5GB of available storage space, or up to 18.5GB of storage space when upgrading from OS X Yosemite or earlier.

MacBook introduced in 2015 or later
MacBook Air introduced in 2012 or later
MacBook Pro introduced in 2012 or later
Mac mini introduced in 2012 or later
iMac introduced in 2012 or later
iMac Pro (all models)
Mac Pro introduced in 2013, plus mid-2010 or mid-2012 models with a recommended Metal-capable graphics card.

To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . If your Mac isn't compatible with macOS Mojave, the installer will let you know.

Finally after a few seconds, that 'starting application' window would disappear, and on the takbar on the bottom of the page, the Citrix Viewer icon would show up. A small little spinning wheel would begin under the icon, followed by the, Citrix 'Starting application,' window.

Make a backup

Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.

Get connected

It takes time to download and install macOS, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.

Download macOS Mojave

For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of the Mac operating system.

If you still need macOS Mojave, use this App Store link: Get macOS Mojave.

Begin installation

After downloading, the installer opens automatically.

Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.

If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.

Allow installation to complete

Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.

Learn more

If you have hardware or software that isn't compatible with Mojave, you might be able to install an earlier macOS, such as High Sierra, Sierra, or El Capitan.
macOS Mojave won't install on top of a later version of macOS, but you can erase your disk first or install on another disk.
You can use macOS Recovery to reinstall macOS.

Apple rightfully has a reputation of having its products 'just work.' And 99% of the time, that adage holds true. Until it doesn't. When things do go wrong, Apple's error messages are cryptic, at times offering no obvious clue as to how to remedy them. One such error is the 'Authentication Error' message when trying to log into iMessage and FaceTime on your Mac, even if you've successfully logged into iCloud.

The problem

For a non-obvious reason, my previously properly running Mac could no longer log into iMessage or FaceTime despite being successfully logged into iCloud. Notes synced, Documents synced, Photos was working, etc.

Trying to log into iMessage triggers my two-factor authentication mechanism as expected. But when prompted for my iCloud username and password, and after a long timeout period, I simply get an 'Authentication Error.'

Facebook Messenger For Mac Mojave

The potential fix

The fix involves getting Apple's servers to re-initialize your Mac hardware to be allowed to access your iCloud services.

Log out of iCloud on your Mac

Open System Preferences.
Click Apple ID.
Source: iMore
Click Overview.
Click Sign Out…
Source: iMore
Follow the instructions to keep or delete iCloud data like calendars, reminders, and photos from your Mac.
Source: iMore
Restart your Mac.

Log into your iCloud.com web account

Navigate to iCloud.com in Safari.
Log in with your iCloud credentials.
Source: iMore
Click Account Settings.
Click your problematic Mac under My Devices.
Source: iMore
Click the X next to the Mac.
Click Remove.
Source: iMore
Click Done.
Source: iMore

Sign back into iCloud on your Mac

Open System Preferences.
Click Sign In.
Source: iMore
Sign in with your iCloud credentials.
Enter your Mac sign-in credentials.
Source: iMore
Click OK.
Source: iMore

Once you're signed back into iCloud on your Mac, you should be signed back into Messages and FaceTime automatically.

Final comments

This is but one solution (of the myriad of suggestions found online) that worked for me. Let us know in the comments if this fix helped you too!

macOS Catalina

Main

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