How to fix iCloud authentication error, unsupported Apple ID on iPhone XS/XS Max

iCloud problems are popular issues among Apple devices, even with the new iPhone XS/XS Max. So, this post today will highlight helpful workarounds as well as potential solutions to fix iCloud problems on the new Apple iPhone XS/XS Max. Keep reading on this post to figure out how to face the iCloud authentication error as well as unsupported Apple ID error on your new iPhone.

Before moving on to the troubleshooting, if you are searching for a solution to different issues, you can see the troubleshooting post that we’ve already addressed some of the most common problems reported by iPhone XS/XS users. Find issues that are occurring on your phone and use the solutions offered.

How to Fix iPhone Xs/Xs Max iCloud authentication error

Before resolving software errors that have prevented your iPhone Xs/Xs Max from accessing the iCloud server, you should check your Internet connection. The easiest way to do so is toggling the Wi-Fi off and then turning it back on. After that, restart your iPhone to clear cache and refresh it. Once restarted, launch browser and try browsing different websites. If they are loading successfully, it means the internet connection is fine.

Method 1: Sign out from iCloud and then log back in

There might be a random glitch like what sometimes occur to your online email accounts, so signing out and logging back into your iCloud account will clear out the error. There are different ways you can do this, through a web browser on your computer or straight from your iPhone Xs/Xs Max.

To sign out and in iCloud using your computer, simply follow these below steps:

  1. Go to and log in your Apple ID and password. There will be a six-digit verification code sent to your phone number. Note it
  2. Enter the verification code to confirm signing in.
  3. Return to the iCloud page and then simply follow the onscreen instructions to continue signing into your iCloud account.
  4. If you’ve already logged in your iCloud account, now simply click on the iCloud Settings menu and then choose the Sign Out option.

Here’s how to sign out of iCloud directly on your iPhone

  1. Launch Settings app and tap on your account
  2. Then scroll down to and tap the Sign Out 

Follow the onscreen instructions to complete the sign-out process. Once you signed out your iCloud account, reboot your iPhone and then sign it back it. After doing so, retry accessing or syncing files to iCloud and see if the error is gone.

Method 2: Reset your Apple ID password

If the iCloud error still persists on your iPhone, then you should consider resetting the password of your Apple ID account. Some iPhone Xs users have found this workaround helpful when they were facing the iCloud-related issue on their phone. If you want to give it a try, then simply follow these below steps to reset your Apple ID password:

  1. Open Safari and then visit the website.
  2. From there, enter your Apple ID username on the field.
  3. Next, tap onForget Apple ID or Password? link

Follow the onscreen instructions to complete resetting the password. Once you reset your password, sign in to your Apple ID account with the new password you have recently created. If the login is successful, it means your account credentials are ready to go. You can then try syncing to iCloud and check if the problem is already solved.

Method 3: Reset network settings on your iPhone XS/XS Max

Sometimes, performing a network settings reset might be a good solution to get rid of incorrect network settings set up on your phone. Such configuration errors might be the cause of the iCloud syncing system, which triggered the error. Simply follow these steps to reset your iPhone Xs/Xs Max network settings:

  1. Launch the Settings app from the Home screen.
  2. Tap General > ResetReset Network Settings
  3. When prompted, enter your passcode to continue.
  4. Then tap the popup to confirm network settings reset.

After the reset, your iPhone Xs/Xs Max will reboot itself and then load the default network settings. You will have to set up and reconnect to your Wi-Fi network from scratch if you want to use Internet services and get your iPhone back online.

Also see: 7 Common iPhone XS Max Problems And How To Fix Them

Method 4: Update your phone to the latest version

Installing your iPhone Xs/Xs Max to the latest iOS might be also the key to fixing the error if there are some bugs and system issues. New software updates include bug fixes as well as security enhancements. To manually check for updates and download them via over-the-air (OTA), you need to connect your iPhone to the Internet through Wi-Fi. After that, follow these below steps to get started:

  1. Open the Settings app on your device
  2. Tap on GeneralSoftware Update.

If there is an update notification, you just read the details carefully and then follow the onscreen instructions to proceed with the update installation process.

However, you should make sure your iPhone has at least 50% battery life and enough memory space left to allocate the new update file.

Method 5: Factory reset your iPhone Xs/Xs Max

If none of the above methods helps to fix the iCloud authentication error or unsupported Apple ID error, a factory reset will be the best solution. The process will wipe out everything from your iPhone, even including major data corruption, which caused complex system issues. A factory reset will allow you to set up your device as new, and clear any sort of software errors. After that, you can set up your Apple ID or iCloud account as the first time you do that. Here’s how:

  1. Launch Settings app on your computer
  2. Tap General > Reset > Erase All Content and Settings. This option will erase your iPhone Xs/Xs Max
  3. Enter your passcode when prompted.
  4. Tap on the popup again to confirm factory reset.

You can also reset your iPhone Xs/Xs Max through iTunes on your computer. You can also use the tool to update your phone or access Apple services directly on the computer.

If your iPhone is still promoting the iCloud authentication or unsupported Apple ID error after a factory reset, you should escalate the problem to get more help. You can also report the issue to your carrier or contact Apple Support.

These are solutions to fix iCloud authentication or unsupported Apple ID error on your iPhone Xs/Xs Max. If you know other solutions, let’s know in the comment below.