Play Embedded Server with routings in different submodules

application.conf

play.http.secret.key="weirdsecret"
play.http.secret.key=${?APPLICATION_SECRET}

build.sbt

inThisBuild(List(
  organization := "com.example",
  scalaVersion := "2.12.6",
  version := "0.1.0-SNAPSHOT"
))
lazy val root = (project in file("."))
  .settings(name := "play-server")
  .aggregate(module, server)

lazy val module = (project in file("module"))
  .settings(
    libraryDependencies ++= Seq(
      "com.typesafe.play" %% "play-server" % "2.6.13" % Provided
    )
  )

lazy val server = (project in file("server"))
  .settings(
    libraryDependencies ++= Seq(
      "com.typesafe.play" %% "play-akka-http-server" % "2.6.13"
    )
  )
  .dependsOn(module)

ModuleEndpoints.scala

import play.api.mvc._
import play.api.routing.sird._
import play.api.routing.{Router, SimpleRouter}

object ModuleEndpoints extends SimpleRouter {
  def routes: Router.Routes = {
    case GET(p"/getendpoint") => Action { req =>
      Results.Ok("/getendpoint in ModuleEndpoints")
    }
  }
}

MyServer.scala

import play.api.routing.Router
import play.core.server.{AkkaHttpServer, ServerConfig}

object MyServer extends App {

  val routes = Map(
    "/module" -> ModuleEndpoints,
    "/server" -> ServerEndpoints
  )

  val server = AkkaHttpServer.fromRouter(ServerConfig(port = Some(8080)))(routes)

  implicit def combine(routers: Map[String, Router]): Router.Routes =
    routers
      .map { case (prefix, router) => router.withPrefix(prefix).routes }
      .reduceLeft(_ orElse _)
}

ServerEndpoints.scala

import play.api.mvc._
import play.api.routing.sird._
import play.api.routing._

object ServerEndpoints extends SimpleRouter {
  def routes: Router.Routes = {
    case GET(p"/getendpoint") => Action { req =>
      Results.Ok("/getendpoint in ServerEndpoints")
    }
  }
}