io.grpc.StatusRuntimeException: UNAUTHENTICATED: Expected bearer token at header with key [authorization], but found nothing in Camunda 8 Spring Boot

Hi
I am integrating spring boot with self managed camunda 8 and getting the following error while running the application.

io.grpc.StatusRuntimeException: UNAUTHENTICATED: Expected bearer token at header with key [authorization], but found nothing

YML Configuration:

zeebe:
  client:
    broker:
      gateway-address: zeebe-grpc.staging-camunda.example.com
    security:
      plaintext: true

kindly help in this case

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