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I have built a custom connector that connects to an API to ingest data. The API uses OAuth2 authentication, requiring client credentials, client_id, and secret. We're currently using Airbyte version 2.0.1. I'm unsure what the issue is, as I haven't been able to establish a connection. Has anyone else encountered this problem?

This is the error I get by passing grant_type, client_id and client_credentials. I have cleared refresh_token and access_token_value fields.

```airbyte_cdk.sources.concurrent_source.stream_thread_exception.StreamThreadException: Exception while syncing stream BidIndications: access_token is not set```
FYI, BidIndications is the stream name I have created

Hey Lokesh, try setting the `token_refresh_endpoint` field under the *Authenticator -&gt; Advanced* section to the API's OAuth token URL.

It is not working, gives me 401 Client Error: Unauthorized for url