Problem using the word “RSS” as a tag

It’s not possible to do yet due to a bug in WordPress core.

A workaround was provided in WordPress ticket

function disable_canonical_redirection_for_tag_feeds() {
if ( is_feed() && is_tag() )
    remove_action( 'template_redirect', 'redirect_canonical' );
}
add_action( 'wp', 'disable_canonical_redirection_for_tag_feeds' );

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