How to execute gcloud build trigger using curl in us-central1 region?

Question

In Google Cloud Build I select Triggers -> Create Trigger. For region I use us-central1. Event: Webhook Event.

Webhook URL preview shows me the following url:

https://cloudbuild.googleapis.com/v1/projects/PROJECT_ID/triggers/TRIGGER_NAME?key=XXXXXXXX&secret=XXXXXXXX

When I try to curl it I got:

{
  "error": {
    "code": 404,
    "message": "triggerError spanner trigger (11111111111, TRIGGER_NAME) not found",
    "status": "NOT_FOUND"
  }
}

This only happens when I create trigger in us-central1 region. Triggers created in global region works fine.

How should I tell cloudbuild.googleapis.com to look for a trigger from region us-central1?

--- Update ---

This is the way I execute webhooks:

$ curl https://cloudbuild.googleapis.com/v1/projects/{PROJECT}/triggers/hello-central1:webhook \
    -d key=xxx \
    -d secret=xxx
# {
#   "error": {
#     "code": 404,
#     "message": "triggerError spanner trigger (11111111111, hello-central1) not found",
#     "status": "NOT_FOUND"
#   }
# }

$ curl https://cloudbuild.googleapis.com/v1/projects/{PROJECT}/locations/us-central1/triggers/hello-central1:webhook \
    -d key=xxx \
    -d secret=xxx
# {
#   "error": {
#     "code": 400,
#     "message": "Request contains an invalid argument.",
#     "status": "INVALID_ARGUMENT"
#   }
# }

$ curl https://cloudbuild.googleapis.com/v1/projects/{PROJECT}/triggers/{TRIGGER}:webhook \
    -d name=projects/{PROJECT}/locations/us-central1/triggers/{TRIGGER} \
    -d key=xxx \
    -d secret=xxx
# {
#   "error": {
#     "code": 400,
#     "message": "Request contains an invalid argument.",
#     "status": "INVALID_ARGUMENT"
#   }
# }

Answer 1

This is the way to execute trigger from region different from global:

curl https://cloudbuild.googleapis.com/v1/projects/$PROJECT/locations/$REGION/triggers/$TRIGGER:webhook \
    -d key=$KEY \
    -d secret=$SECRET \
    -d trigger=$TRIGGER \
    -d projectId=$PROJECT

Another way:

curl "https://cloudbuild.googleapis.com/v1/projects/$PROJECT/locations/$REGION/triggers/$TRIGGER:webhook?key=$KEY&secret=$SECRET&trigger=$TRIGGER&projectId=$PROJECT" -d {}

Yet another way:

curl -X POST -H Content-Type:application/json "https://cloudbuild.googleapis.com/v1/projects/$PROJECT/locations/$REGION/triggers/$TRIGGER:webhook?key=$KEY&secret=$SECRET&trigger=$TRIGGER&projectId=$PROJECT"