Calling External/third-party URL via feignclient works, but results in warnings

Question

I am trying to use feignclient to call a third party url (sending notifications to android devices)

@FeignClient(value = "external",url = "${android.notification.url}")
public interface AndroidNotificationClient {

    @RequestMapping( method = RequestMethod.POST, consumes = "application/json")
    String sendAndroidNotification(@RequestHeader("Authorization") String auth, @RequestHeader ("Sender") String sender,
                                                 @RequestBody String body);

}

"external" is not defined anywhere - I was told that value is not used for any purponse.

The API calls work, but I get warnings like

2022-05-10 07:52:17.015 WARN  --- [boundedElastic-1]  org.springframework.cloud.loadbalancer.core.RoundRobinLoadBalancer         : No servers available for service: fcm.googleapis.com
2022-05-10 07:52:17.016 WARN  --- [androidNotification8]  org.springframework.cloud.openfeign.loadbalancer.FeignBlockingLoadBalancerClient         : Service instance was not resolved, executing the original request

The relevant portion of the properties file is reproduced below

feign.client.url=http://<our_domain_name>/api
android.notification.url=https://fcm.googleapis.com/fcm/send
android.authorization=key=xxxx
android.sender=id=xxxxx



eureka.client.serviceUrl.defaultZone=${EUREKA_URI:http://<our_domain_name>:<port>/eureka}
eureka.instance.preferIpAddress=true

What am I doing wrong which is resulting in such warnings, and how do I remove them?