build and runのgradle build failedエラーが解消できません

前提・実現したいこと

ここに質問の内容を詳しく書いてください。
androidへのbuild and runの際、gradle build failedエラーが解消できません。

初歩的な質問でしたらすみません。

発生している問題・エラーメッセージ

CommandInvokationFailure: Gradle build failed. 
C:/Program Files/Unity/Hub/Editor/2019.3.0a7/Editor/Data/PlaybackEngines/AndroidPlayer/Tools\OpenJDK\Windows\bin\java.exe -classpath "C:\Program Files\Unity\Hub\Editor\2019.3.0a7\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-5.1.1.jar" org.gradle.launcher.GradleMain "-Dorg.gradle.jvmargs=-Xmx4096m" "assembleRelease"

stderr[

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':launcher'.
> Could not resolve all artifacts for configuration ':launcher:classpath'.
   > Could not resolve com.android.tools.build:gradle:3.4.0.
     Required by:
         project :launcher
      > Could not resolve com.android.tools.build:gradle:3.4.0.
         > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.4.0/gradle-3.4.0.pom'.
            > Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.4.0/gradle-3.4.0.pom'.
               > dl.google.com
      > Could not resolve com.android.tools.build:gradle:3.4.0.
         > Could not get resource 'https://jcenter.bintray.com/com/android/tools/build/gradle/3.4.0/gradle-3.4.0.pom'.
            > Could not GET 'https://jcenter.bintray.com/com/android/tools/build/gradle/3.4.0/gradle-3.4.0.pom'.
               > jcenter.bintray.com

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.