If you want to use the enrollment process, then you should not make configuration changes to your kibana.yml but let the enrollment process handle this for you.
Remove elasticsearch.hosts: ["https://10.0.2.15:9200"] and start the kibana service again. When you navigate to http://localhost:5601/ you will be prompted to enter the enrollment token you generated in Elasticsearch ( please generate a new one, each enrollment token is only valid for 30 minutes)