Slack alerts not sent

I've configured the Slack webhook, modified Windows firewall for both ServersCheck services, sent a test message and received it in the appropriate Slack channel. I then configured the thresholds for the alarms, enable Slack alert for the temperature sensor and since then I do not receive anything on Slack.

I do receive email alerts, I tried changing the webhook for another Slack channel and I don't even receive the test message anymore.

Do you have any suggestion as where I should look at to troubleshoot this issue?

hey, I tested what you had and encountered no issues, try to restart your PC. If you are able to receive emails it might also be possible that your network blocks the alerts going to slack