Keynote for Mac: sign in to iCloud with an Apple ID
Shared presentations are stored on iCloud, and to access them you must sign in to iCloud with your Apple ID.
If you’ve ever purchased something from the iTunes Store or App Store, you have an Apple ID. If you don’t remember your Apple ID, or you don’t have one, click one of the links below the iCloud sign-in fields to either create an Apple ID or retrieve your Apple ID or password.
Sign in to iCloud
On a Mac: Choose Apple menu > System Preferences, then click iCloud.
On an iOS device: On the Home screen, tap Settings, then tap iCloud.
On the web: Go to iCloud.com.
On a Windows computer: In Windows 7 or later, click the iCloud app or tile on the Start screen, or choose iCloud from the Start menu.
If you can’t open the presentation, it’s possible the email address or phone number used to invite you isn’t associated with your Apple ID. Sign in to iCloud with your Apple ID, then follow the instructions to verify your email address or your phone number and associate it with your Apple ID. Afterward, sign in to iCloud using the primary email address or phone number associated with your Apple ID.
Note: If you don’t want to associate another email address with your Apple ID, you could instead ask the owner of the shared presentation to invite you again using an email address or phone number that’s already associated with your Apple ID.