Re: It is not possible to obtain device's certificate. ...
WMP11 is not without its glitches but if you want a good sync without many problems use WMP10 it has many more capabilities and upgrades than the 11 considering its relatively new i also have the Sansa e250 surprinsingly enough it holds 4 gigs not 2
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Make sure you are connected to the internet, and make sure that your music service subscription is up to date. If both of these conditions hold, and you still get the message, then delete the songs off the player, and reload them after converting them to Mp3 format - the WMA format is the only one that has a device certificate problem.
You have to refresh the synchronization with Windows Media Player every 30 days or so. Normally this message only appears for Rhapsody-downloaded tracks, nut Microsoft now requires that you sync the device every so often just to make sure any wma files have the correct license on them. Convert those songs to Mp3 format, and you will not have any problems like this one.