Custom Engine Agent Environment Issue

I'm having some issues of environment variables on the Lab "Build a custom Engine Agent" on the SSO exercise.

In the tutorial, it went straight in creating the "aad.manifest.json" file with variables like
AAD_APP_OBJECT_ID, SECRET_AAD_APP_CLIENT_SECRET, AAD_APP_OAUTH_AUTHORITY or AAD_APP_OAUTH_AUTHORITY_HOST .... without explaining where to get it or save it (I'm a beginner)

If not providing these variables, when debugging, i have some errors like

    return new ClientAuthError(errorCode, additionalMessage);
           ^
ClientAuthError: invalid_client_credential: Client credential (secret, certificate, or assertion) must not be empty when creating a confidential client. An application should at most have one credential
    at createClientAuthError (C:\Users\tri.le\Documents\Code\TeamsAgent-Azure\node_modules\@azure\msal-common\dist\error\ClientAuthError.mjs:255:12)
    at ConfidentialClientApplication.setClientCredential (C:\Users\tri.le\Documents\Code\TeamsAgent-Azure\node_modules\@azure\src\client\ConfidentialClientApplication.ts:279:19)
    at new ConfidentialClientApplication (C:\Users\tri.le\Documents\Code\TeamsAgent-Azure\node_modules\@azure\src\client\ConfidentialClientApplication.ts:71:14)
    at new Authentication (C:\Users\tri.le\Documents\Code\TeamsAgent-Azure\node_modules\@microsoft\teams-ai\src\authentication\Authentication.ts:71:26)
    at new AuthenticationManager (C:\Users\tri.le\Documents\Code\TeamsAgent-Azure\node_modules\@microsoft\teams-ai\src\authentication\Authentication.ts:244:40)
    at new Application (C:\Users\tri.le\Documents\Code\TeamsAgent-Azure\node_modules\@microsoft\teams-ai\src\Application.ts:290:36)
    at Object.<anonymous> (C:\Users\tri.le\Documents\Code\TeamsAgent-Azure\src\app\app.ts:32:13)
    at Module._compile (node:internal/modules/cjs/loader:1734:14)
    at Module.m._compile (C:\Users\tri.le\Documents\Code\TeamsAgent-Azure\node_modules\ts-node\src\index.ts:1618:23)
    at loadTS (node:internal/modules/cjs/loader:1826:10) {
  errorCode: 'invalid_client_credential',
  errorMessage: 'Client credential (secret, certificate, or assertion) must not be empty when creating a confidential client. An application should at most have one credential',
  subError: ''
}

I have figured my way to register an App on Azure, then fill some variables in .env.local.user like AAD_APP_CLIENT_ID, AAD_APP_CLIENT_SECRET, but after that it still has some error about missing Microsoft ID , probably about those variables BOT_ID, BOT_TYPE, BOT_TENANT_ID.

Can you instruct me on this ?

Start with the "Build a custom Engine Agent" SSO exercise, the aad.manifest.json variables, and the .env.local.user settings mentioned in the report; use the src/app/app.ts stack-trace entry point to trace which values are required. Document where the Azure app and bot values come from and how to configure them so debugging no longer reports missing credentials or Microsoft identity settings.