Authorization requires a cascading parameter of type Task\<AuthenticationState>. Consider using CascadingAuthenticationState to supply this.

Authorization requires a cascading parameter of type Task\<AuthenticationState>. Consider using CascadingAuthenticationState to supply this.

.Net 6.x

add <CascadingAuthenticationState>

G:\x\src\Presentation\Admin\App.razor

<CascadingAuthenticationState>
    <Router AppAssembly="@typeof(App).Assembly">
        <Found Context="routeData">
            <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
            <FocusOnNavigate RouteData="@routeData" Selector="h1" />
        </Found>
        <NotFound>
            <PageTitle>Not found</PageTitle>
            <LayoutView Layout="@typeof(MainLayout)">
                <p role="alert">Sorry, there's nothing at this address.</p>
            </LayoutView>
        </NotFound>
    </Router>
</CascadingAuthenticationState>

detail:https://docs.microsoft.com/en-us/aspnet/core/blazor/security/?view=aspnetcore-6.0#expose-the-authentication-state-as-a-cascading-parameter

.Net 3.x

add <CascadingAuthenticationState>

G:\x\src\Presentation\Admin\App.razor

<CascadingAuthenticationState>
    <Router AppAssembly="@typeof(Program).Assembly">
        <Found Context="routeData">
            <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
        </Found>
        <NotFound>
            <LayoutView Layout="@typeof(MainLayout)">
                <p>Sorry, there's nothing at this address.</p>
            </LayoutView>
        </NotFound>
    </Router>
</CascadingAuthenticationState>