https://www.reddit.com/.rss?feed=...
to
https://www.reddit.com/new/.rss?sort=new&feed=...

https://www.reddit.com/r/help/comments/50si18/are_reddit_rss_feeds_still_broken_on_feedly/
https://www.reddit.com/r/help/comments/40x7d1/why_are_my_private_rss_feeds_not_updating/