Hi! I've had a Second Generation Echo Plus for a year and a half and I could set an alarm with music coming from Spotify until about a month ago. Now, she will confirm that she has set the alarm to a certain song on Spotify but when morning comes I get the default alarm sound and no music.
It doesn't seem to be a Spotify account issue because I can play and ask songs during the day. However, I've tried re-linking the Spotify account but it didn't change a thing. I have also tried resetting the Echo Plus.
Weirdly, I don't see any discussion about this issue anywhere online and I'm a bit worried because this was one of my favorite features!