My Angular project don't get my custom Spring AUTH server as the issuer

I created a simple spring OAuth2 server and it is working fine when i type the URL in browser.

code of my sample auth server:

package com.onlinemall.authserver.config;

import com.nimbusds.jose.jwk.JWKSet;
import com.nimbusds.jose.jwk.RSAKey;
import com.nimbusds.jose.jwk.source.ImmutableJWKSet;
import com.nimbusds.jose.jwk.source.JWKSource;
import com.nimbusds.jose.proc.SecurityContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.core.annotation.Order;
import org.springframework.security.config.Customizer;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.OAuth2AuthorizationServerConfiguration;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.oauth2.core.AuthorizationGrantType;
import org.springframework.security.oauth2.core.ClientAuthenticationMethod;
import org.springframework.security.oauth2.core.oidc.OidcScopes;
import org.springframework.security.oauth2.server.authorization.client.InMemoryRegisteredClientRepository;
import org.springframework.security.oauth2.server.authorization.client.RegisteredClient;
import org.springframework.security.oauth2.server.authorization.client.RegisteredClientRepository;
import org.springframework.security.oauth2.server.authorization.config.ClientSettings;
import org.springframework.security.oauth2.server.authorization.config.ProviderSettings;
import org.springframework.security.provisioning.InMemoryUserDetailsManager;
import org.springframework.security.provisioning.JdbcUserDetailsManager;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.LoginUrlAuthenticationEntryPoint;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.CorsConfigurationSource;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import javax.sql.DataSource;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.util.Arrays;
import java.util.UUID;

@Configuration
public class SecurityConfig{



    public CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration configuration = new CorsConfiguration();
        configuration.setAllowedOrigins(Arrays.asList("http://localhost:4200"));
        configuration.setAllowedMethods(Arrays.asList("GET","POST","PUT"));
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", configuration);
        return source;
    }

    @Bean
    @Order(2)
    public SecurityFilterChain authorizationServerSecurityFilterChain(HttpSecurity http)
            throws Exception {
        OAuth2AuthorizationServerConfiguration.applyDefaultSecurity(http);
        http.cors().configurationSource(corsConfigurationSource());
        http
                // Redirect to the login page when not authenticated from the
                // authorization endpoint
                .exceptionHandling((exceptions) -> exceptions
                        .authenticationEntryPoint(
                                new LoginUrlAuthenticationEntryPoint("/login"))
                ).cors(cors -> cors.disable());

        return http.build();
    }

    @Bean
    @Order(3)
    public SecurityFilterChain defaultSecurityFilterChain(HttpSecurity http)
            throws Exception {
        http.cors().configurationSource(corsConfigurationSource());
        http
                .authorizeHttpRequests((authorize) -> authorize
                        .anyRequest().authenticated()
                )
                // Form login handles the redirect to the login page from the
                // authorization server filter chain
                .formLogin(Customizer.withDefaults());

        return http.build();
    }

    @Bean
    public UserDetailsService jdbcUserDetailsService(DataSource dataSource) {
        String usersByUsernameQuery = "select username, password, true from users where username = ?";
        String authsByUserQuery = "select usr_mp_rl.username,perm.permissionname " +
                "from user_role_mapping usr_mp_rl, role_permission rl_per, permissions perm " +
                "where  usr_mp_rl.roleid=rl_per.roleid " +
                "and rl_per.permissionid=perm.permissionid " +
                "and usr_mp_rl.username = ? ";

        JdbcUserDetailsManager users = new JdbcUserDetailsManager(dataSource);

        users.setUsersByUsernameQuery(usersByUsernameQuery);
        users.setAuthoritiesByUsernameQuery(authsByUserQuery);

        return users;
    }

    @Bean
    public RegisteredClientRepository registeredClientRepository() {
        RegisteredClient registeredClient = RegisteredClient.withId(UUID.randomUUID().toString())
                .clientId("client1")
                .clientSecret("{noop}myClientSecretValue")
                .clientAuthenticationMethod(ClientAuthenticationMethod.CLIENT_SECRET_BASIC)
                .authorizationGrantType(AuthorizationGrantType.AUTHORIZATION_CODE)
                .authorizationGrantType(AuthorizationGrantType.REFRESH_TOKEN)
                .redirectUri("http://127.0.0.1:9000/login/oauth2/code/users-client-oidc")
                .redirectUri("http://127.0.0.1:4545/authorized")
                .scope(OidcScopes.OPENID)
                .scope("read")
                .clientSettings(ClientSettings.builder().requireAuthorizationConsent(true).build())
                .build();
        return new InMemoryRegisteredClientRepository(registeredClient);
    }

    @Bean
    public JWKSource<SecurityContext> jwkSource() {
        KeyPair keyPair = generateRsaKey();
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
        RSAKey rsaKey = new RSAKey.Builder(publicKey)
                .privateKey(privateKey)
                .keyID(UUID.randomUUID().toString())
                .build();
        JWKSet jwkSet = new JWKSet(rsaKey);
        return new ImmutableJWKSet<>(jwkSet);
    }

    private static KeyPair generateRsaKey() {
        KeyPair keyPair;
        try {
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
            keyPairGenerator.initialize(2048);
            keyPair = keyPairGenerator.generateKeyPair();
        }
        catch (Exception ex) {
            throw new IllegalStateException(ex);
        }
        return keyPair;
    }

    @Bean
    public ProviderSettings providerSettings() {
        return ProviderSettings.builder()
                .issuer("https://localhost:9000")
                .build();
    }




}

after that I create the angular application referring to the document.

My code is working fine for the given auth server in the document. but when i change the auth server to my custom server, it gives this error