This error usually only appears when your iCloud storage is too full. To check this, please follow the steps below:

1. On your iPhone, iPad or iPod touch, go to Settings > [your name] > iCloud. (The bar graph shows your overall storage usage.)
2. Tap Manage Account Storage or Manage Storage for more details. (Below the graph, you see a list of apps and features and how much iCloud storage they use. The apps and features that use the most storage are at the top of the list. You can tap an app or feature for more information.)

If storage is full or close to full, please clear up some space to see if that resolves the issue. If not, please submit a support request and our team will take a lookl!