All the songs are AAC audio files and the location seems to be the same as all the other songs in my library.
I have tried updating my music library from all 3 devices. My itunes and Sonos software is up to date. I would appreciate and suggestions. Thank you.
Best answer by Tobylund
The issue with greyed out songs on my iphone was not associated with the library location. I deleted the album downloads off my phone and then re-downloaded them. Sonos recognized them with no issue. I assume somehow the downloads were interrupted somehow and never completed?