Hi ,
As per your suggestion i have change code flow now calling from angular and we obtain token from angular.
For your reference I have shared XHR files and logs as well over email, please check.
After a successful login from an external login provider, I want to manually check whether the user exists in my system and if I find the appropriate user, log them into my system.
In this scenario, we have an API ExternalUserLoginCallbackAsync() method However, after calling the method GetExternalLoginInfoAsync(), it returns null.
This info is important because the info.ProviderKey (user ID) is passed to the GetUserDetailsInfo() API to fetch user details from the external identity provider (IDP) and insert into DB.
Why does GetExternalLoginInfoAsync() return null even though I have already successfully logged in to the identity provider (IDP) using my Angular code

ok maliming,
I have a question that you haven't answered yet: how does POC integration work, and why is my existing code not functioning as expected? Why do I need to change the code flow of my existing code? same poc code implemented in my project .
your team member shared me that POC project his name is "liangshiwei" below ticket url. https://abp.io/support/questions/7788/Custom-Redirection-to-third-party-IdP-Login-Page-and-Dashboard-Post-Authentication-in-ABPIO?CurrentPage=2
This is correct flow:
- request to authserver project
 - authserver check the user and redirect to angular(localhost:4200) with the code
 - angular use the code to get tokens.
 You have to give the code to angular app. this is standard Oauth2 code flow to let the angular get token from authserver.
same code existing application as well, And don't why it's not working.
We are currently facing an unresolved issue with client authentication that has been escalating internally. This problem is impacting our productivity and is also affecting our client, who is waiting for a resolution.
Given the urgency and complexity of the situation, I believe scheduling a meeting would be beneficial. This will allow us to discuss the issue in detail and work towards a swift resolution.
Could you please arrange a meeting at your earliest convenience? Your assistance in this matter would be greatly appreciated
We have a requirement like this, which is why we added the integration on the API side. The same implementation i have done in ABP sample project as well. I have shared the POC project HAR file over email; could you please check it and let me know how the requests are going?
I have shared email please check.
In my POC project, the token API call works fine from the Angular project. However, in the existing application, the token API does not get called when using SSO OIDC login.
Do we need to manually add the token API method to retrieve the token information? In the POC, it was automatically invoked after I redirected the URL. Is the issue occurring because the user is not login in properly using SSO?
below screen shot POC project token API.
ok let me check