Why do Amazon Echo Frames say, You can't play Apple Music on your Connected Accessory?

I just received my Echo Frames (Generation 2 on Launch day), and the device will not respond to requests to play selections from Apple Music.

If I make a request on my Amazon Echo Frames like, "Play Christmas Music from Apple Music", the device says, "I can't play Apple Music on your connected accessory".

Is this an Apple Issue or an Amazon Issue? Is this by design? Can anyone else confirm this behavior?

The Echo Frames will play media from TuneIn by saying, "Alexa, Play WOKV from Tunein".

I can obviously stream generic audio playing on my iPhone to my Echo Frames as generic Bluetooth Speaker, and control it from my watch. I was just curious why I can't request directly from my Echo Frames -- like I can from every other Echo Enabled Device (Sonos, Echo, Echo Dot, Echo Tap, Echo Flex, Echo Auto, etc... )

Any thoughts?