Note: OS is Ubuntu 20.04 and running Elastic Agent v7.15.1
I'm trying to setup a Fleet Server on my server and Elastic-Agent doesn't seem to be respecting the option for specifying my Fleet Server URL endpoint via the Kibana UI? For example, please see the screenshots and command below:
- I try to start Fleet with the following command:
sudo ./elastic-agent install -f --fleet-server-es=http://localhost:9200 --fleet-server-service-token=<hidden> --fleet-server-policy=<hidden> --insecure
And get the following output:
2021-10-26T20:29:22.075-0400 INFO cmd/enroll_cmd.go:372 Generating self-signed certificate for Fleet Server
2021-10-26T20:29:28.088-0400 INFO cmd/enroll_cmd.go:724 Fleet Server - Starting
2021-10-26T20:29:30.091-0400 INFO cmd/enroll_cmd.go:705 Fleet Server - Running on policy with Fleet Server integration: <hidden>; missing config fleet.agent.id (expected during bootstrap process)
2021-10-26T20:29:30.092-0400 WARN [tls] tlscommon/tls_config.go:98 SSL/TLS verifications disabled.
2021-10-26T20:29:30.178-0400 INFO cmd/enroll_cmd.go:432 Starting enrollment to URL: https://elastic:8220/
2021-10-26T20:29:30.282-0400 WARN [tls] tlscommon/tls_config.go:98 SSL/TLS verifications disabled.
2021-10-26T20:29:31.022-0400 INFO cmd/enroll_cmd.go:247 Successfully triggered restart on running Elastic Agent.
Successfully enrolled the Elastic Agent.
Elastic Agent has been successfully installed.
As you can see in the above output, it says:
Starting enrollment to URL: https://elastic:8220/
I literally can't find any references of this saved in either the Kibana UI or in my files.
In the Kibana Logs I see:
[elastic_agent][error] Could not communicate with fleet-server Checking API will retry, error: fail to checkin to fleet-server: Post "https://elastic:8220/api/fleet/agents/<hidden>/checkin?": dial tcp <hidden>:8220: connect: connection refused
Here's my Fleet Server config in the Kibana UI:
Can anyone assist me as to where the heck Elastic Agent is pulling this URL/Port from, and why my custom value Fleet Server host in the Kibana UI is not working? 
Note: I've also tried uninstall elastic-agent completely as well.
Any help would be appreciated!!!!
tldr: Elastic Agent is outputing "Starting enrollment to URL: https://elastic:8220/" when i've set my Fleet Server URL to "https://elastic:3001" in the Kibana UI which causes the Fleet Server to crash subsequently.