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Invalid 
Contact: mailto:ml-bug-report@lycorp.co.jp
Policy: https://bugbounty.linecorp.com/en
Terms: https://www.lycorp.co.jp/en/company/terms/
Privacy Policy: https://www.lycorp.co.jp/en/company/privacypolicy/
Preferred-Languages: en, ja
Canonical: https://line.me/.well-known/security.txt
1 Error
(line 4, col 1) Invalid extension field name 'Privacy Policy'
Field names cannot contain spaces. Per RFC 5322, field names must be printable US-ASCII characters excluding spaces and colons.
How to fix
Use hyphens instead of spaces in extension field names. Example: 'Custom-Field: value' instead of 'Custom Field: value'