App.razor

@inject NavigationManager NavigationManager

<CascadingValue Name="AccessToken" Value="AccessToken">

<CascadingAuthenticationState>
    <Router AppAssembly="@typeof(App).Assembly" PreferExactMatches="@true">
        <Found Context="routeData">
            <AuthorizeRouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)">
                <NotAuthorized>
                    @{
                        var returnUrl = NavigationManager.ToBaseRelativePath(NavigationManager.Uri);
                        NavigationManager.NavigateTo($"login?redirectUri={returnUrl}", forceLoad: true);
                    }
                </NotAuthorized>
                <Authorizing>
                    Wait...
                </Authorizing>
            </AuthorizeRouteView>
        </Found>
        <NotFound>
            <LayoutView Layout="@typeof(MainLayout)">
                <p>Sorry, there's nothing at this address.</p>
            </LayoutView>
        </NotFound>
    </Router>
</CascadingAuthenticationState>
</CascadingValue>
@code{
    [Parameter] public string AccessToken { get; set; }
}