The payload in operation "Get auth token (service)" in the reference postman collection is wrong as it is using SUBSERVICE. In fact, it seems the same payload than the (right) operation "Get auth token (subservice)" is using but with some fields in the JSON changing order
The right payload to use is:
{
"auth": {
"identity": {
"methods": [
"password"
],
"password": {
"user": {
"domain": {
"name": "{{SERVICE}}"
},
"name": "{{USER}}",
"password": "{{PASSWORD}}"
}
}
},
"scope": {
"domain": {
"name": "{{SERVICE}}"
}
}
}
}