How to fix Apple iPhone X iCloud authentication error, unsupported Apple ID [Troubleshooting Guide]

This post highlights some helpful workarounds and potential solutions to address iCloud problems on the Apple iPhone X. Read on to figure out how to deal with the iCloud authentication error as well as unsupported Apple ID error on your iPhone X handset.

Before we move on to our troubleshooting, if you are looking for a solution to a different issue, make sure you drop by our troubleshooting page as we’ve already addressed some of the most common problems reported by our readers. Find issues that are similar with yours and use the solutions we suggested. If you still need our help after that, then feel free to contact us by filling up our iPhone issues questionnaire.

How to troubleshoot iPhone X with iCloud authentication error?

Before troubleshooting software errors that may have prevented your iPhone X from accessing the iCloud server, check or refresh your Internet connection. The simplest way to do so is by toggling the Wi-Fi switch off and then on again. Then restart your iPhone to clear internal memory cache and to refresh iOS. After restarting, open a browser app then try browsing different websites. If all sites are loading successfully, it means that your Internet connection is fine.

The next thing you should do is to check the current service status of the iCloud server. You can view this information from the system status page of Apple Support website. If iCloud is down, then there’s no need to troubleshoot your device because the problem isn’t on your end. In this case, you just have to wait until the service is back up and running again. It should be just quick considering that Apple services are constantly monitored by their engineers. If nothing is wrong with the iCloud server and yet you’re still getting the same iCloud authentication or unsupported Apple ID error on your iPhone X, then performing any of these subsequent solutions may help you.

First solution: Sign out from iCloud and then sign in again.

Basing on the error prompt, it implies that something is wrong with your account information and is most likely the reason why you cannot access iCloud services on your device. Should this be just a random glitch like what sometimes occur to your other online email accounts, signing out and back in to your iCloud account will likely clear out the error. There are different ways for this to be done, either through a computer browser or straight from your iPhone X.

To sign in and out of iCloud through a web browser on your computer, follow these steps:

  1. Navigate to and sign into your iCloud account by entering your Apple ID and password. A six-digit verification code will then be sent to your device.
  2. Enter the verification code to confirm iCloud sign in.
  3. Go back to the iCloud page and follow the onscreen prompts to continue signing into your iCloud account.
  4. If you’ve already signed into your iCloud account, all you have to do is click on the iCloud Settings menu from the iCloud page and then select the option to Sign Out.

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

  1. Tap Settings from the Home screen.
  2. Tap on [your name].
  3. Then scroll down to and tap the Sign Out button.

Follow the rest of the onscreen instructions to complete the sign out process. After signing out of iCloud, reboot your iPhone X and then sign in to iCloud again. Here’s how:

  1. Tap the option to Sign in to your [device].
  2. Enter your Apple ID and password.
  3. If your iCloud account is protected with two-factor authentication, enter the six-digit verification code and complete sign in.

Once you have successfully signed into your account, retry accessing or syncing files to iCloud and see if the error is gone.

Second solution: Reset your Apple ID password.

If the iCloud error persists, then you may have to consider resetting the password for your Apple ID account. Many people have found this workaround helpful when dealing other iCloud-related issue on their iOS devices. If you wish to give it a shot, then follow these steps to reset your Apple ID password:

  1. Open a browser app and then head over to the website.
  2. Enter your Apple ID username on the given field, if necessary.
  3. Then tap the link that says, Forget Apple ID or Password?

Follow the rest of the given instructions to complete the password reset. After resetting your password, try logging into your Apple ID account using the new password you created. If the login is successful, then your account credentials are good to go. Try syncing to iCloud and see if the problem is fixed.

Third solution: Reset network settings on your iPhone X.

Performing a network settings reset may be necessary to get rid of any incorrect network settings or invalid network options set up on the phone. Such configuration errors might have ruined the phone’s iCloud syncing system and eventually triggered this error. To rule this out, follow these steps to reset network settings on your iPhone X:

  1. Tap to open the Settings app from the Home screen.
  2. Tap General.
  3. Scroll to and tap Reset.
  4. Select Reset Network Settings option.
  5. If prompted, enter your device passcode to continue.
  6. Then tap the option to confirm network settings reset.

After the reset, your iPhone will reboot by itself and then loads with the default network settings and options. This means that you need to set up and reconnect to your Wi-Fi network to use Internet services and to get your iPhone back online.

Fourth solution: Update phone software to the latest version.

Installing the latest iOS version on your iPhone X may also be the key to fixing the error if it’s attributed to some bugs and system issues. New software updates usually embed fix patches for security enhancements as well as bug fixes. To manually check for and download updates via over-the-air, your iPhone must be connected to the Internet via Wi-Fi. Then follow these steps to get started:

  1. Tap Settings from the Home screen.
  2. Tap General.
  3. Tap Software Update.

If you see an update notification, read the details and then follow the given instructions to proceed with the update file downloading and installation process.

Make sure your iPhone has ample of battery life and memory space to allocate the new update file.

Fifth solution: Factory reset your iPhone X.

Among the last options to consider if the iCloud authentication error or unsupported Apple ID error persists after exhausting all prior solutions would be a factory reset. This will wipe everything from your iPhone system including major data corruption that caused complex system issues. A factory reset will also let you set up your device as new, thus clear from any sort of software errors. By then you can start setting up your Apple ID or iCloud account as if it’s the first time you do so. You can do a quicker way of resetting iOS through settings. Here’s how:

  1. Tap Settings from the Home screen.
  2. Tap General.
  3. Scroll to and tap Reset.
  4. Select the option to Erase All Content and Settings. This is the option to master reset your iPhone X
  5. Enter your device passcode when asked.
  6. Then tap the option to confirm factory reset.

Alternatively, you can reset your iPhone X through iTunes on your computer. You can also use iTunes to update iOS as well as access Apple services including iCloud on the computer.

If your iPhone X is still prompting the same iCloud authentication or unsupported Apple ID error after doing a factory reset, then it’s time to escalate the problem for more help. You can report the issue to your device carrier or contact Apple Support instead. Let them know of what exactly had transpired and how your iPhone X ended up prompting the iCloud authentication error. Doing so will likewise prompt the support team to double check their system and verify if the problem is on their end.

Connect with us

If you need more help with the use of certain functions and features of the Apple iPhone X smartphone, feel free to visit our Tutorial Page. There you can find a list of how-to contents, step-by-step tutorials, as well as answers to FAQs regarding iPhone X. If you have other concerns or encountered some troubles while using the phone, you can reach us through this form. Just be sure to tell us more details of the problem or device issue(s) you may have and we will be more than happy to assist you further.