// by checking remote IDP if the relevant users are still active and present.
func (sys *IAMSys) purgeExpiredCredentialsForExternalSSO(ctx context.Context) {
	parentUsersMap := sys.store.GetAllParentUsers()
	var expiredUsers []string
	for parentUser, puInfo := range parentUsersMap {
		// There are multiple role ARNs for parent user only when there
		// are multiple openid provider configurations with the same ID

	}

	return nil
}

// ParentUserInfo contains extra info about a the parent user.
type ParentUserInfo struct {
	subClaimValue string
	roleArns      set.StringSet
}

// GetAllParentUsers - returns all distinct "parent-users" associated with STS
// or service credentials, mapped to all distinct roleARNs associated with the
// parent user. The dummy role ARN is associated with parent users from