First call

Verification status

Pending verification: this pair has not yet been executed with sandbox credentials.

Both hosts in Environments were probed with a credential-free POST /auth, and both answered 401 rather than failing to connect: they resolve and respond. Neither has been exercised with a real sandbox key yet.

The pair

1. Authenticate, see Authentication.
2. Then call the cheapest Umbrella operation, phone status:

curl -X POST "$UMBRELLA_SANDBOX_BASE_URL/phone-service/phoneStatus" \
  -H "Authorization: Bearer $ACCESS_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"phoneNumber": "+15555550100"}'

No sample response is shown here until this pair has been run with real sandbox credentials.