Can’t add feed with Newsblur API

Hi, I use lireapp on iOS, I use Newsblur but when I go through lireapp to add this feed: https://blog.nicolas.brondin-bernard.com/rss/

I’m in contact with the developer of lireapp, he explains me that it comes from the Newsblur API.

For example:

https://newsblur.com/rss_feeds/feed_autocomplete?term=https%3A//blog.nicolas.brondin-bernard.com/rss/

Returns the symbol []
While this link correctly returns the rss feed.

https://newsblur.com/rss_feeds/feed_autocomplete?term=https%3A//www.theverge.com/rss/index.xml

Sincerely.