BG77 DNS not working?

I am using the BG77 NB IoT Module and need to make a DNS-Request.
Therefore I am configuring the DNS Servers using the Command AT+QIDNSCFG:
AT+QIDNSCFG=“1,10.20.157.142”,“10.20.189.201”

I receive
AT+QIDNSCFG=1,“10.20.157.142”,“10.20.189.201”
OK

immediately afterwards I try:
AT+QIDNSCFG=1

and receive
+QIDNSCFG: 1,“0.0.0.0”,“0.0.0.0”

OK

The following DNS request with AT+QIDNSGIP=… does return
+QIURC: “dnsgip”,565

In the BG95&77_TCP/IP Application note i found the NOTE:
“Configuration of DNS server address in not supported currently.”
What does this mean ? How can I make a DNS request without configuring the DNS server address?

Maybe it is under development , I need to double check the status with R&D

Normally, the Operator will get DNS with download link

Is there an update to this issue @Stephen.Li-Q ?
I am trying this using BG95-M2 and configuring the DNS Servers seems to be impossible.

AT+QIDNSCFG=1
+QIDNSCFG: 1,“0.0.0.0”,“0.0.0.0”
AT+QIDNSCFG=1,“8.8.8.8”,“8.8.8.8”
ERROR

Thanks in advance!