newExternalWorkflowStub not working "Called from non workflow or workflow callback thread"

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1

I want to send signal to another workflow, once I receive a success webhook.

var failureMonitorWorkflow = Workflow.newExternalWorkflowStub(FailureMonitorWorkflow.class, workflowId);
failureMonitorWorkflow.markSuccess(orderNumber);

This is giving me error Called from non workflow or workflow callback thread

2

Static methods of Workflow class can be called from the workflow code only.

Use workflow client to send signal from all other code.