Angular angular-auth-oidc-client identity4 SLO SSO Logout from all clients not working

Question

I could not achieve single signout from all clients in angular. The code I used is on below. The logout function is calling from angular app and signoff from the current application but it is not signout from all client (other angualr applications which is using the same identity server)

Please help me to achieve signout from all clients. Thanks in Advance

IdentityServer4 configuration of the client

new Client
        {
            //testing logout
            ClientId = "clientangularSLO",
            ClientName = "Angular Client",
            AllowedGrantTypes = GrantTypes.Code,
            RequireClientSecret = false,
            AllowedScopes = new List<string>
            {
                IdentityServerConstants.StandardScopes.OpenId,
                IdentityServerConstants.StandardScopes.Profile,
                "api1",
                "roles"
            },

            
            RedirectUris = new List<string> {"http://localhost:4300"},
            PostLogoutRedirectUris = new List<string> {"http://localhost:4300"},
            AllowedCorsOrigins = new List<string> {"http://localhost:4300" },


            RequireConsent= false,
            RequirePkce = true,
            AllowAccessTokensViaBrowser = true,
            AllowOfflineAccess = true
        }

Angular OIDC Configuration

oidcConfigService.withConfig({
  stsServer: 'https://localhost:4001',
  redirectUrl: window.location.origin,
  clientId: 'clientangularSLO',
  scope: 'openid profile',
  responseType: 'code',
  triggerAuthorizationResultEvent: true,
  postLogoutRedirectUri: `${window.location.origin}/unauthorized`,
  
  logLevel: LogLevel.Debug,
  historyCleanupOff: true,

  
});

Angular Logout Code

import { OidcSecurityService } from 'angular-auth-oidc-client';

constructor(private oidcSecurityService: OidcSecurityService, private router: Router, private route: ActivatedRoute){}
  
logout() {
    this.oidcSecurityService.logoff();
  }