iTunes won’t burn purchased songs to cd, saying they are Apple Music songs

i have purchased an album I would like to burn to a cd for my commute but it won’t, stating the songs are a part of Apple Music. I originally were listening to them via Apple Music but I purchased the album in hopes of burning a disc. Why won’t it let me burn them even though I have purchased the songs? My computer is authorized to use iTunes and I don’t have a problem with other songs I’ve purchased.