Get subscriber details does not include the plmnID

[patriciareinoso]

Describe the bug

When we get all the subscribers, each element in the list includes plmnID and ueId.
However, when we get the details of the subscribers, the plmnID is empty.

ubuntu@test-traefik:~$  curl ${WEBUI_IP}:5000/api/subscriber
[{"plmnID":"20893","ueId":"imsi-208930100007487"}]

ubuntu@test-traefik:~$ curl  ${WEBUI_IP}:5000/api/subscriber/imsi-208930100007487
{"plmnID":"","ueId":"imsi-208930100007487","AuthenticationSubscription": ...

To Reproduce

CREATE SUBSCRIBER

curl -v ${WEBUI_IP}:5000/api/subscriber/imsi-208930100007487
--header 'Content-Type: text/plain'
--data '{
"UeId":"208930100007487",
"opc":"981d464c7c52eb6e5036234984ad0bcf",
"key":"5122250214c33e723a5dd523fc145fc0",
"sequenceNumber":"16f3b3f70fc2"
}'

CREATE DEVICE GROUP

curl -v ${WEBUI_IP}:5000/config/v1/device-group/cows
--header 'Content-Type: application/json'
--data '{
"imsis": [
"208930100007487"
],
"site-info": "demo",
"ip-domain-name": "pool1",
"ip-domain-expanded": {
"dnn": "internet",
"ue-ip-pool": "172.250.1.0/16",
"dns-primary": "8.8.8.8",
"mtu": 1460,
"ue-dnn-qos": {
"dnn-mbr-uplink": 20000000,
"dnn-mbr-downlink": 200000000,
"traffic-class": {
"name": "platinum",
"arp": 6,
"pdb": 300,
"pelr": 6,
"qci": 8
}
}
}
}'

CREATE NETWORK SLICE

curl -v ${WEBUI_IP}:5000/config/v1/network-slice/default
--header 'Content-Type: application/json'
--data '{
"slice-id": {
"sst": "1",
"sd": "010203"
},
"site-device-group": [
"cows"
],
"site-info": {
"site-name": "demo",
"plmn": {
"mcc": "208",
"mnc": "93"
},
"gNodeBs": [
{
"name": "demo-gnb1",
"tac": 1
}
],
"upf": {
"upf-name": "upf-external.core.svc.cluster.local",
"upf-port": "8805"
}
}
}'

LIST ALL SUBSCRIBERS

Expected behavior

The same plmnID gotten when listing all the subscribers should be found in the plmnID field of the subscriber's details.