Artists and labels with a space in the name have URLs that are "not allowed for the selected link type, or is incorrectly formatted.".
Junodownload uses a "+" to represent the spaces, for example:
https://musicbrainz.org/artist/e38b38f4-ea06-4eca-9cd3-f6cb42c69d56
https://www.junodownload.com/artists/Kurwastyle+Project/
https://musicbrainz.org/label/6068f7f0-f705-4b12-a3fe-e1db09ecca93
https://www.junodownload.com/labels/Bounce+Back/