It has nothing to do with WordPress. Your server is configured to refuse access from other domains. All you need to enable CORS Origin.
This will allow request from other domains. But it will decrease security. You might want to change the * (allow all) to your sub domain. Just put it in your .htaccess file.
<IfModule mod_headers.c>
<FilesMatch "\.(jpg|png|gif)$">
Header set Access-Control-Allow-Origin "*"
</FilesMatch>
</IfModule>
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