Connection between APM-Server and Elasticsearch seems not to be established

elasticsearch and kibana setting is done.

But, APM-Server is getting an error when it starts.

error :

  1. unable to authenticate user [kinana_system] for REST request
  2. API key: unable to find apikey with id elastic
  3. precondition failed: error querying cluster_uuid: status_code=401

I tried with elastic / kibana_system / API_keys. But it cannot access with es.
Of course, the password that i use can log into kibana website.

is it wrong about Self-signed Certification? Please help me......

apm-server.yml :
apm-server:
host: "0.0.0.0:8200"
output.elasticsearch:
hosts: ["0.0.0.0"]
protocol: "https"
username: "kinana_system"
password: "classified"
ssl.verification_mode: none

elasticsearch.yml :
network.host: 0.0.0.0
http.port: 9200
xpack.security.enabled: true
xpack.security.enrollment.enabled: true
xpack.security.http.ssl:
enabled: true
keystore.path: certs/http.p12
xpack.security.transport.ssl:
enabled: true
verification_mode: certificate
keystore.path: certs/transport.p12
truststore.path: certs/transport.p12
cluster.initial_master_nodes: ["SSVELA1V"]
http.host: 0.0.0.0
xpack.security.authc.api_key.enabled: true