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nRF9160: Unable to activate eDRX

Hello,
i am trying to activate eDRX with the unmodified at_host sample on a nRF9160DK.
After connecting i get empty strings for <NW-Provided_eDRX_value> and <Paging_time_window>
with the +CEDRXRDP command. Can you tell me if i am doing something wrong?

AT+CFUN?
+CFUN: 0
OK
AT%XSYSTEMMODE=0,1,0,0
OK
AT+CEDRXS=1,5,"0010"
OK
AT+CEDRXRDP
+CEDRXRDP: 5,"0010","0000","0000"
OK
AT+CFUN=1
OK
AT+CGDCONT?
+CGDCONT: 0,"IP","iot.1nce.net","100.109.136.6",0,0
OK
AT+CEDRXRDP
+CEDRXRDP: 5,"0010","",""
OK
AT%XMONITOR
%XMONITOR: 5,"","","26201","D2FE",9,8,"01E4260E",299,3740,38,36,"","11100000","00001100","00101111"
OK
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