How to create JWT token using IdentityServer4 - identityserver4

Question

In my application (.Net core application) using IdentityServer4, at present creates "Reference" Token for authentication. But I would need to change the token type from "Reference" type to "JWT" token. I found couple of articles regarding that and tried as mentioned, but still I am not able to get the "JWT" token and I am getting "Reference" token only.
I followed the details mentioned in the below sites, but no luck.
IdentityServer4 requesting a JWT / Access Bearer Token using the password grant in asp.net core
https://codebrains.io/how-to-add-jwt-authentication-to-asp-net-core-api-with-identityserver-4-part-1/
https://andrewlock.net/a-look-behind-the-jwt-bearer-authentication-middleware-in-asp-net-core/
Can anyone let me know how could we change the token type from "Reference" to "JWT" token? Is there any custom code/class to be created to achieve this?
Below is the code used in my Client class.
new Client
{
ClientId = "Client1",
ClientName = "Client1",
AllowedGrantTypes = GrantTypes.ResourceOwnerPassword,
AllowedScopes = new List<string>
{
IdentityScope.OpenId,
IdentityScope.Profile,
ResourceScope.Customer,
ResourceScope.Info,
ResourceScope.Product,
ResourceScope.Security,
ResourceScope.Sales,
ResourceScope.Media,
ResourceScope.Nfc,
"api1"
},
AllowOfflineAccess = true,
AlwaysSendClientClaims = true,
UpdateAccessTokenClaimsOnRefresh = true,
AlwaysIncludeUserClaimsInIdToken = true,
AllowAccessTokensViaBrowser = true,
// Use reference token so mobile user (resource owner) can revoke token when log out.
// Jwt token is self contained and cannot be revoked
AccessTokenType = AccessTokenType.Jwt,
AccessTokenLifetime = CommonSettings.AccessTokenLifetime,
RefreshTokenUsage = TokenUsage.OneTimeOnly,
RefreshTokenExpiration = TokenExpiration.Sliding,
AbsoluteRefreshTokenLifetime = CommonSettings.AbsoluteRefreshTokenLifetime,
SlidingRefreshTokenLifetime = CommonSettings.SlidingRefreshTokenLifetime,
IncludeJwtId = true,
Enabled = true
},
And in my startup.cs, I have this below code.
public void ConfigureServices(IServiceCollection services)
{
var connStr = ConfigurationManager.ConnectionStrings[CommonSettings.IDSRV_CONNECTION_STRING].ConnectionString;
services.AddMvc();
services.AddAuthentication(options =>
{
options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddJwtBearer(options =>
{
// base-address of your identityserver
options.Authority = "http://localhost:1839/";
// name of the API resource
options.Audience = "api1";
options.RequireHttpsMetadata = false;
});
services.AddAuthorization(options =>
{
options.DefaultPolicy = new AuthorizationPolicyBuilder(JwtBearerDefaults.AuthenticationScheme)
.RequireAuthenticatedUser()
.Build();
}
);
var builder = services.AddIdentityServer(options => setupAction(options))
.AddSigningCredential(loadCert())
.AddInMemoryClients(Helpers.Clients.Get())
.AddInMemoryIdentityResources(Resources.GetIdentityResources())
.AddInMemoryApiResources(Resources.GetApiResources()).AddDeveloperSigningCredential()
.AddConfigStoreCache().AddJwtBearerClientAuthentication()
//Adds a key for validating tokens. They will be used by the internal token validator and will show up in the discovery document.
.AddValidationKey(loadCert());
builder.AddConfigStore(options =>
{
//CurrentEnvironment.IsEnvironment("Testing") ?
// this adds the config data from DB (clients, resources)
options.ConfigureDbContext = dbBuilder => { dbBuilder.UseSqlServer(connStr); };
})
.AddOperationalDataStore(options =>
{
// this adds the operational data from DB (codes, tokens, consents)
options.ConfigureDbContext = dbBuilder => { dbBuilder.UseSqlServer(connStr); };
// this enables automatic token cleanup. this is optional.
options.EnableTokenCleanup = true;
options.TokenCleanupInterval = CommonSettings.TokenCleanupInterval;
});
}
Kindly let me know, what change(s) to be done to get JWT token. Thanks in advance.