tokenAuth, err := newAuthenticatorFromTokenFile(config.TokenAuthFile)
		if err != nil {
			return nil, nil, nil, nil, err
		}
		tokenAuthenticators = append(tokenAuthenticators, authenticator.WrapAudienceAgnosticToken(config.APIAudiences, tokenAuth))
	}
	if len(config.ServiceAccountKeyFiles) > 0 {