https://emailtechsolutions.blogspot.com/2019/05/why-is-my-new-iphone-not-connecting-to.html
If you are going through this issue, I can understand your pain as your device is just not being able to connect to iCloud and so you can't do any of your tasks that require the use of iCloud. There are a few possible fixes that you can apply and see if they work for you.
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