@Marc Stridgen
As of Saturday morning, I was getting a 404 error for the embed on two mobile devices, one Android and one iPhone but not on the desktop. I showed it to @opentype and he could replicate the error 1 time in 10 try's and suggested it was not related to mobile vs desktop.
This morning everything seems to work but I am going to continue to watch it. I did get the error on my Android this morning and then I cleared my cache and all is good. IDK.
Maybe Spotify was doing something weird last week?