SARA AFF R412M stuck at COPS command

I’m trying to get a NBIOT connection with my SARA AFF R412M, but the COPS command never responds with OK (I waited several minutes).

These are the commands I use:

AT+CFUN=0
AT+URAT=8
AT+UDCONF=1,1
AT+CMEE=2
AT+CGDCONT=1,"IP","nb.inetd.gdsp"
AT+CFUN=1
AT+COPS=1,2,"20404"

I found the problem, after connecting the battery the board connects fine.

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