MCP servers such as https://supabase.com/docs/guides/getting-started/mcp will return 201 on successful token exchange. The current logic breaks the flow even after the exchange has been successful on the resource side - something as simple as the following fixes throwing an unnecessary error here.

...
if response.status_code != 200 and response.status_code != 201:
    raise OAuthTokenError(f"Token exchange failed: {response.status_code}")
....