Error Code Portal
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1104

Error 1104: A variation of this email address is already taken in our system. Only one variation is allowed.

Alternative forms: Error 1104

What does this code mean?

Code 1104 · An issue reported by Cloudflare HTTP errors.

Official explanation · Original text

This error indicates that the email address you are trying to add is already taken in the system. This error can occur if an email has been added with some variation of the email you're trying to add. For example, [email protected] and [email protected] will be treated the same in our system.

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

Error 1104: A variation of this email address is already taken in our system. Only one variation is allowed. ↗

Creator: Cloudflare, Inc. and contributors
License: Creative Commons Attribution 4.0 International
Checked on: 2026-11-12

Modifications: Selected introductory official description; Markdown stripped; original Korean product context added. Direct official error page retains the complete cause and resolution instructions.

Source details · Original licenses and notices