WSO2 APIM giving authentication failure while I am trying to authenticate API using OAuth2 but working fine with apikey. No change implemented at configs level and it was working earlier fine but now giving below error

{
  "code": "900901",
  "message": "Invalid Credentials",
  "description": "Access failure for API: /letshego-api-gw/test/v1, version: v1 status: (900901) - Invalid Credentials. Make sure you have provided the correct security credentials"
}

I have checked the DB table IDN_OAUTH2_ACCESS_TOKEN and the token_state is ACTIVE.

Below errors are coming in the logs while hitting the API

[2024-04-30 14:50:04,455]  WARN - APIAuthenticationHandler API authentication failure due to Invalid Credentials for requestURI=/letshego-api-gw/test/v1/test/mock

I am using Resident KeyManager for authentication and Postgres DB for configs.

What could be the reason for this issue?