Hi,
die Frage ist, die Du den Favoriten anlegst.
Bei mir steht im XML
<item id="FV:2/37" parentID="FV:2" restricted="false">
<dc:title>BBQ-Hits</dc:title>
<upnp:class>object.itemobject.item.sonos-favorite</upnp:class>
<r:ordinal>1</r:ordinal>
<res protocolInfo="x-sonosapi-radio:*:audio/x-sonosapi-radio:*">x-sonosapi-radio:catalog%2fplaylists%2fB0BYRF1C2W%2f%23chunk-bCqh22LMQxOjlwy0KhilbA?sid=201&flags=8300&sn=5</res>
<upnp:albumArtURI>https://m.media-amazon.com/images/I/81Iu+FhiryL.jpg</upnp:albumArtURI>
<r:type>instantPlay</r:type>
<r:description>Amazon Music Sender</r:description>
<r:resMD><DIDL-Lite xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:upnp="urn:schemas-upnp-org:metadata-1-0/upnp/" xmlns:r="urn:schemas-rinconnetworks-com:metadata-1-0/" xmlns="urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/"><item id="100c206ccatalog%2fplaylists%2fB0BYRF1C2W%2f%23chunk-bCqh22LMQxOjlwy0KhilbA" parentID="00020000flat_search%2f%3ftype%3dcatalog_playlist%26count%3d50%23catalog_playlists_search_desc:grillen" restricted="true"><dc:title>BBQ-Hits</dc:title><upnp:class>object.item.audioItem.audioBroadcast</upnp:class><desc id="cdudn" nameSpace="urn:schemas-rinconnetworks-com:metadata-1-0/">SA_RINCON51463_X_#Svc51463-0-Token</desc></item></DIDL-Lite></r:resMD>
</item>
bei Dir:
<item id="FV:2/33" parentID="FV:2" restricted="false">
<dc:title>Weihnachten</dc:title>
<upnp:class>object.itemobject.item.sonos-favorite</upnp:class>
<r:ordinal>10</r:ordinal>
<res/>
<upnp:albumArtURI>https://m.media-amazon.com/images/I/71Mnv6kZouL._US2746_BL50_BG34,34,34_CLa%7C2746,2746%7C71Mnv6kZouL.jpg,81e2BXMxOtL.jpg,81N6E7fhOzL.jpg,71e0hvBHLtL.jpg%7C0,0,2746,2746+0,0,1373,1373+1373,0,1373,1373+0,1373,1373,1373+1373,1373,1373,1373.jpg</upnp:albumArtURI>
<r:type>shortcut</r:type>
<r:description>Amazon Music</r:description>
<r:resMD><DIDL-Lite xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:upnp="urn:schemas-upnp-org:metadata-1-0/upnp/" xmlns:r="urn:schemas-rinconnetworks-com:metadata-1-0/" xmlns="urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/"><item id="10080044library%2Fplaylists%2F55a60971-ead0-4ec5-b4f2-786f507792f2%2F%23library_playlist" parentID="10080044library%2Fplaylists%2F55a60971-ead0-4ec5-b4f2-786f507792f2%2F%23library_playlist" restricted="true"><dc:title>Weihnachten</dc:title><upnp:class>object.item</upnp:class><desc id="cdudn" nameSpace="urn:schemas-rinconnetworks-com:metadata-1-0/">SA_RINCON51463_X_#Svc51463-3215b0e3-Token</desc></item></DIDL-Lite></r:resMD>
</item>
das „res“ Tag ist hierbei die URI.
Interessant ist, dass „r:type“ sich unterscheidet ( „instantPlay“ vs. „shortcut“).
Ich öffne einfach eine Playliste, klicke auf die drei Punkte und wähle "„Unter Sonos Favoriten speichern“.
Gruß,
Thorsten