EG-25-g - connection to network refuse after 10 sec

modems that show context #1 )AT+CGDCONT?) with correct APN connect well.
modems (same host, same modem) that show context #1 w/o APN (APN=“”) connect and then refused by the NW.

Using CGDCONT to set the APN for context 1 did not help
Could not find any other way to set/initialize the context correctly

Please advise

Hello, please check your network using AT+QENG=“SERVINGCELL”. You can also set APN using AT+QICSGP=1,1," apn-name “,”“,”",1.