Forgot ID
If you forget your iCloud ID but you also don’t remember the email you used to set it up what do you do?
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See if you can recover the ID/password. Use every email address you can think of.
Apple ID - How to find your Apple An iCloud e-mail address is an Apple ID.
For the Apple ID password, enter the Apple (iCloud) ID, and click Forgot Password. See if you can get an email option if necessary.