Apple's iCloud service is currently experiencing a widespread outage, with many users potentially impacted.
iMessage, iCloud Calendar, Find My, and many other services experiencing an outage

Did you download a file and can’t figure out where it is? In this tutorial, we will show you where those downloaded files are saved in your iPhone or iPad’s local storage.
If you are trying to access iCloud-based services like Calendar, Contacts, and others, but coming up short, there's a reason.
Not too long ago Apple released macOS Catalina 10.15.4 to the public, along with iOS 13.4 and iPadOs 13.4, which brought the long-awaited iCloud Drive Folder Sharing feature to the public.
Following weeks of beta seeds, Apple has finally released the next update for iOS and iPadOS, bringing the public version to 13.4.
After an initial delay, which Apple issued in late 2019, it looks like Apple is finally ready to bring iCloud Drive folder sharing to the masses.
The iCloud.com website is now available with a new landing page on mobile devices which finally brings support for some of its web apps such as Photos, Notes and Reminders. Previously, accessing the website from an iPhone or Android used to bring up a landing page informing you that you couldn't get to the web apps whilst using a mobile browser.
The iCloud folder sharing feature in macOS Catalina 10.15, which released Monday for public consumption, seems to have been officially delayed until spring 2020.
Learn how to share iCloud files and folders with one or more people, change their access permissions, and stop sharing when done from your iPhone, iPad, Mac, and web browser.
Try as I might, but I couldn't for the life of me put a folder in iCloud named "Dropbox". As it turns out, it's not just "Dropbox" — people have found out that Apple maintains a blacklist of file and folder names which customers should avoid using at all cost in their iCloud Drive.
Learn how to change the default save location where Apple's Safari browser stores files you download on your iPhone, iPad, or Mac.