Get the Scenario ID

https://a.blazemeter.com/api/v4/masters/<masterId>

curl -X GET https://a.blazemeter.com/api/v4/masters/<masterId> -H "Content-Type: application/json" --user 'id:secret'

In the response message, look for the "scenariosMapping" section, then note the ID associated with the scenario name you want to reference.  The relevant segment of the response will appear similar to the following example, in which one scenario is a JMeter test and the other is an End User Experience Monitoring test:

 "scenariosMapping": [
 {
 "id": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
 "name": "JMX",
 "isEndUserExperience": false
 },
 {
 "id": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
 "name": "EUX",
 "isEndUserExperience": true
 }