Yes, I tried streaming SiriusXM (the Spa channel in particular) to my Dot. But at the time I used the free preview. I don't think it matters whether I was using the free preview or my own car subscription. But I found, to my chagrin, that
I could not ask Alexa what song my Dot was playing like I can when streaming Amazon Music. My Echo Show doesn't show that information (like my car does) either. This negates the reason I listen to Spa, which is to discover new (or old) artists I have never heard of before, so I can buy more of their stuff. Artists get only pennies/stream/song, so I think I am helping them to make more music if I buy a download or a whole album.
Do you use the synchronous feature, or individual streams? If you are streaming SiriusXM, can you figure out what song is playing? How do you "bluetooth them"
to your satellite receiver? I can imagine if the satellite receiver is a source, but going the other way has me

.