Get Album Artwork Feature Not Working

Mainly on new releases. I have several new CDs that I can't get album artwork for even though they are in the iTunes store. Earl Sweatshirt, Lower Dens, Death Grips, A$AP Rocky and Thee Oh Sees are the CDs that the get album artwork feature doesn't work for. I'm using version 12.1.2.27 64-bit. This has been going on since March. Anybody else experiencing the same problem?