Why the Epic Online Service (EOS) OSS access token is not refreshed?

Development Programming & Scripting C++
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I found an occurence where the EOS OSS’ IdentityInterface does not return a correct access token (expired).

  • I used (IdentityInterface->GetAuthToken(...)) to get the token.
  • I created a scheduler run each minute to obtain the token and detect whether there is a change or not.
  • The access token expiration is 2 hour. But at the end of the 2nd hour, the scheduler didn’t detect any change of access token.
  • But, at 3rd hour, the scheduler detected a change of access token which is a new token that was refreshed at 2nd hour.

Is this a bug from EOS OSS or EOS SDK?
Any workaround to ensure the GetAuthToken() can obtain an actual token correctly?

Thanks.