How to analyse attach issue for BG96

Hi support.
I bought BG96 evaluation kit (below), and I’m trying to attach to network in category M1 mode.
https://www.top-electronicsusa.com/quectel-bg96-gg-starter-kit-complete-initial-evaluation-kit-for-bg96-gg-ltem1-module-p-17741.html

Now, I use open air interface(OAI) BTS in category M1 mode (FDD band13 BW10MHz).
BG96 finds plmn “00101” , but BG96 can’t attach to the OAI network.
It seems that BG96 has already got system information1 and 2.
But, BG96 don’t start sending RACH to the network.
I also tried to set manual plmn selection by sending " AT+COPS=1,2,“00101” ",
but it turned out to receive error response. And, it also didn’t go well when I sent
" AT+COPS=0 " (auto plmn selection).

I have checked my SIM card by attaching LTE UE to OAI LTE mode BTS and
same EPC as I use for category M1 testing.

Please give me some advice If you have any idea to analyse this situation.

AT command detail
///////////////////////////////////////////////////////////////////////
AT+QCFG=“band”,0,1000,0

OK
AT+QCFG=“band”,0,400A0E189F,0

OK
AT+QCFG=“iotopmode”

+QCFG: “iotopmode”,0

OK
AT+QCFG=“nwscanmode”,3

OK
AT+QCFG=“nwscanseq”

+QCFG: “nwscanseq”,020301

OK
AT+QCFG=“roamservice”,1

OK
AT+QCFG=“servicedomain”,1

OK
AT+CGREG?

+CGREG: 0,4

OK
AT+CGDCONT=1,“IP”,“oai”

OK
AT+QICSGP=1,1,“oai”

OK
AT+COPS=?

+COPS: (1,“Test PLMN 1-1”,“Test1-1”,“00101”,8),(0,1,2,3,4),(0,1,2)

OK
AT+COPS=1,2,“00101”

+CME ERROR: 30
AT+COPS=1,2,“00101”

+CME ERROR: 30
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Just an idea, try to set APN with IPV4V6 in second parameter.
AT+CGDCONT=1,“IPV4V6”,“oai”
And are you sure that the same APN is used for LTM too?