I ve started to use this songkick feature a couple months ago. It worked the first time only.
I don't know if any changes have been made. I asked songkick support team and they told me that everything is ok on their side.
Can you please take a look?
Songkick artist page: https://www.songkick.com/artists/7091789-los-antiguos
Spotify Artist URI: spotify:artist:25WqiGGqVjN0gLpVHqaP91
Songkick Case #: 393739