Fixed this in our project because of a silly error. The Unity Project name (aka directory name) had a comma in it. Removing the project from Unity Hub, renaming the directory and re-adding to Unity Hub fixed this error.

Exception: D:\2019.4.20f1\Editor\Data\il2cpp\build/deploy/net471/UnityLinker.exe did not run properly!

Failed running "D:\2019.4.20f1\Editor\Data\il2cpp\build/deploy/net471/UnityLinker.exe" @"C:/Users/ghisl/Downloads/Run, Jump and Duck/Temp/StagingArea/assets/bin/Data/Managed/response.rsp"

stdout:
Fatal error in Unity CIL Linker
System.UnauthorizedAccessException: Access to the path 'C:\Users\ghisl\Downloads\Run' is denied.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize)
at System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials credentials, IWebProxy proxy, RequestCachePolicy cachePolicy)
at System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn)
at System.Xml.XmlTextReaderImpl.OpenUrlDelegate(Object xmlResolver)
at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
at System.Threading.CompressedStack.Run(CompressedStack compressedStack, ContextCallback callback, Object state)
at System.Xml.XmlTextReaderImpl.OpenUrl()
at System.Xml.XmlTextReaderImpl.Read()
at System.Xml.XPath.XPathDocument.LoadFromReader(XmlReader reader, XmlSpace space)
at System.Xml.XPath.XPathDocument..ctor(String uri, XmlSpace space)
at Unity.Linker.UnityDriver.ParseArguments(Pipeline p, UnityLinkContext context, ArrayList custom_steps, I18nAssemblies& assemblies)
at Unity.Linker.UnityDriver.Run()
at Unity.Linker.UnityDriver.RunDriverWithoutErrorHandling()
at Unity.Linker.UnityDriver.RunDriver()
stderr:

UnityEditorInternal.Runner.RunProgram (UnityEditor.Utils.Program p, System.String exe, System.String args, System.String workingDirectory, UnityEditor.Scripting.Compilers.CompilerOutputParserBase parser) (at <8d21067e8d9c494db25a2b2485216e63>:0)
UnityEditorInternal.Runner.RunManagedProgram (System.String exe, System.String args, System.String workingDirectory, UnityEditor.Scripting.Compilers.CompilerOutputParserBase parser, System.Action`1[T] setupStartInfo) (at <8d21067e8d9c494db25a2b2485216e63>:0)
UnityEditorInternal.AssemblyStripper.RunAssemblyLinker (System.Collections.Generic.IEnumerable`1[T] args, System.String& out, System.String& err, System.String linkerPath, System.String workingDirectory) (at <8d21067e8d9c494db25a2b2485216e63>:0)
UnityEditorInternal.AssemblyStripper.StripAssembliesTo (System.String outputFolder, System.String& output, System.String& error, System.Collections.Generic.IEnumerable`1[T] linkXmlFiles, UnityEditorInternal.UnityLinkerRunInformation runInformation) (at <8d21067e8d9c494db25a2b2485216e63>:0)
UnityEditorInternal.AssemblyStripper.RunAssemblyStripper (UnityEditorInternal.UnityLinkerRunInformation runInformation) (at <8d21067e8d9c494db25a2b2485216e63>:0)
UnityEditorInternal.AssemblyStripper.StripAssemblies (System.String managedAssemblyFolderPath, UnityEditorInternal.BaseUnityLinkerPlatformProvider unityLinkerPlatformProvider, UnityEditorInternal.IIl2CppPlatformProvider il2cppPlatformProvider, UnityEditor.RuntimeClassRegistry rcr, UnityEditor.ManagedStrippingLevel managedStrippingLevel) (at <8d21067e8d9c494db25a2b2485216e63>:0)
UnityEditorInternal.IL2CPPBuilder.Run () (at <8d21067e8d9c494db25a2b2485216e63>:0)
UnityEditorInternal.IL2CPPUtils.RunIl2Cpp (System.String tempFolder, System.String stagingAreaData, UnityEditorInternal.IIl2CppPlatformProvider platformProvider, System.Action`1[T] modifyOutputBeforeCompile, UnityEditor.RuntimeClassRegistry runtimeClassRegistry) (at <8d21067e8d9c494db25a2b2485216e63>:0)
UnityEditor.Android.PostProcessor.Tasks.RunIl2Cpp.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context) (at <d76da2c9a45b4b02b93f56ae560b1d44>:0)
UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context) (at <d76da2c9a45b4b02b93f56ae560b1d44>:0)
UnityEditor.Android.PostProcessAndroidPlayer.PostProcess (UnityEditor.BuildTarget target, System.String stagingAreaData, System.String stagingArea, System.String playerPackage, System.String installPath, System.String companyName, System.String productName, UnityEditor.BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.Build.Reporting.BuildReport report) (at <d76da2c9a45b4b02b93f56ae560b1d44>:0)
UnityEditor.Android.AndroidBuildPostprocessor.PostProcess (UnityEditor.Modules.BuildPostProcessArgs args, UnityEditor.BuildProperties& outProperties) (at <d76da2c9a45b4b02b93f56ae560b1d44>:0)
UnityEditor.PostprocessBuildPlayer.Postprocess (UnityEditor.BuildTargetGroup targetGroup, UnityEditor.BuildTarget target, System.String installPath, System.String companyName, System.String productName, System.Int32 width, System.Int32 height, UnityEditor.BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.Build.Reporting.BuildReport report) (at <8d21067e8d9c494db25a2b2485216e63>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

"I had this problem because of UnityPurchasing. At what in one project the assembly worked and there is no other. I copied the UnityChannel and UnityPurchasing folders into a non-working project. After that, the build on ios was successful"

as you said when i removed the two folders mentioned and the build was successful, when i again put the folders i'm not able to take build.

is there any solution

Try to delete all *.js scripts from your project folder. IL2CPP cant compile JavaScript to C++

I had this problem because of UnityPurchasing. At what in one project the assembly worked and there is no other. I copied the UnityChannel and UnityPurchasing folders into a non-working project. After that, the build on ios was successful