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Domain input needs correction

That doesn't look like a domain. Try something like yourbrand.com.

Exact messages

  • That doesn’t look like a domain. Try something like yourbrand.com.

  • Please enter a valid domain

  • Domain name is required

  • New domain name is required

  • Old domain name is required

  • Your domain needs at least 8 characters before the dot.

  • Domain prefix must be at least 8 characters long

  • Domain prefix can only contain letters, numbers, hyphens, and underscores

  • Domain prefix must contain at least one letter

  • Domain prefix cannot contain forbidden word: {word}

  • Domain prefix cannot use restricted word: {word}

  • Domain prefix contains inappropriate language: {word}

  • You cannot use .runnerai.dev or .runnerai.com domains

  • That domain is already in use. Try another.

  • Domain is already in use

Meaning: The entered domain or Runner-hosted domain prefix does not satisfy the form’s rules, or that name is already assigned. Prefix rules are for the prefix field, not a reason to rewrite an unrelated custom domain.

Enter the domain in the format the field requests, such as yourbrand.com. For prefix errors, follow the stated length/character requirements and choose a different name for restricted or occupied names. If a domain belongs to another one of your stores, inspect its existing assignment rather than repeatedly adding it.

Success: The field is accepted and the intended domain appears on the correct store. Adding a domain is not proof that DNS and HTTPS are ready. Escalate an apparently incorrect ownership/in-use result with the domain and both store identifiers.

All preview, publishing, and domain errors

Last updated on September 10, 2026

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