How do I set a MediaPlayer texture material to another plane?

I have a Media Player that plays a video on a plane with mp_fp_tex_1_Mat as its material. when a button is pressed, I want to copy that Media Player to another plane that is in a “full screen” view . Any suggestions on how to do this?
I currently have in the constructor:

	for (int i = 1; i < size+1; i++) {
		FString str_path = FString("Material'/Game/media_players/");
		FString str_path2=FString("");
		str_path2.Append(prefix);
		str_path2.Append("_");
		str_path2.AppendInt(i); 
		str_path2.Append("_Mat'");
		str_path = str_path + str_path2;
		static ConstructorHelpers::FObjectFinder<UMaterial> Material(*str_path);
		if (Material.Object != NULL)
		{
			UMaterial* mat = (UMaterial*)Material.Object;
			MyMaterials->Add(str_path2,mat);
		}
	}

and in my set material , I tried setting UMaterial to dynamic to no avail :

SetViewerMaterialToMediaPlayer(UMaterial* material) {

	// set material. 
	if (viewer1 == NULL)
	{
		return;
	}
	DynamicMaterialInst = UMaterialInstanceDynamic::Create(material, this);
	//set paramater with Set***ParamaterValue
	//DynMaterial->SetScalarParameterValue("MyParameter", myFloatValue)
	int matNum = viewer1->GetStaticMeshComponent()->GetNumMaterials();
	for (int i = 0; i < matNum; i++)
	{
		viewer1->GetStaticMeshComponent()->SetMaterial(i, material);
	}

I also have another method that successfully picks the material based on the name/id of the Plane .
Set material is just setting a checkerboard material to the plane. It is not setting the media player to the plane . I’m not sure why.