You don't mention what rev you re on.
As a point of information....my XM folder info was missing from May '16 through Oct this year.
The 2017.42 a88c8d5 update gave me all the folders the next day. However, it was "lost" the following day; I called Sirius and got a refresh and later that day it was working again and it now worked for over a week.
Thus, try calling Sirius and get a refresh and make sure your car can see the sky......