I can't create an iCloud account on my iPhone
My iPhone X is not creating iCloud
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If you are getting the message, that the maximum number of Apple IDs has been reached, you will have to create an Apple ID on a different device, for example your computer. After that you can use this newly created Apple ID on the device that gave you the error message.
If you see a Could Not Create Apple ID or Could Not Set Up iCloud message - Apple Support