Valton,
Generally there is no such Slack integration based on Linux or Windows machines. If you configure the Wazuh server correctly, it should show the intended alerts to your Slack.
To verify your Slack configuration, share your configuration details here with me. Remember to mask any sensitive information before sharing.
Additionally, check if the integrations.log file has any output using cat /var/ossect/logs/integrations.log.
Looking forward to your response.