Check your inbox for emails from Apple
Your Apple ID might be included in some emails from Apple. Search your inbox for receipts as well as repair, support, or billing emails from Apple.
If your email address is masked (email@example.com), the number of asterisks might not match the number of characters in your email address.
See if you're already signed in with your Apple ID
Check to see if you're signed in on your device, or check if you're signed in to Apple apps or services.
On your iPhone, iPad, or iPod touch
Tap Settings, then tap [your name].
On your Mac
Choose Apple menu > System Preferences, then click Apple ID.
On your PC
Open iCloud for Windows, then look for your Apple ID under your name.
Other ways to find your Apple ID
FaceTime isn't available in all countries or regions.