Hello,
I have the following issue with Alexa <--> Sptify integration.
I have setup Alexa with its own account ( to simplify sharing playlists), and have added my Alexa e-mail account to my Family plan.
In my Sportify client for Alexa, I am following the Playlists from everyone in the family.
So everything was working fine, and we could ask Alexa to play any of playlists it was following. 
But about 2 weeks ago, Alexa stop finding any of the Playlists is following, even tough they show up in the Spotify Client Playlists.
If I switch profiles in Alexa, to my own profile, and ask to play the same playlist, it works. It only does not work if the playlist is one of the followed playlists.