Old iCloud account

If Apple ID is signed in the device see the article If you forgot your Apple ID email address or phone number - Apple Support

If its an old account not signed in the device use the link https://iforgot.apple.com/appleid#!&section=appleid

Rainwaters Said:

"Old iCloud account: Cana old iCloud account be found?"

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Perhaps.

If it is your account, then try this link: If you Forgot your Apple ID - Apple Support

Can you post the screen shot in English , what does this error means please .