This would need to be done by way of a workflow. In workflows you can set the enrollment based on the ticket creation and have it send a Slack notification. This is how we have our setup and it works well, you can choose to send alerts to either an individual or to a Slack channel.
Unfortunately there’s no way (to my knowledge) to automatically “add” or “cc” someone on a ticket in HubSpot. The individual could go to the ticket and follow it, but beyond that I’m not familiar with a way to accomplish this without custom code.
Alternatively, you could also create a ticket workflow from scratch, where you enroll tickets based on ‘When filter criteria is met’ → ‘Create date is less than 1 day ago’ and then use the Slack workflow action to send a notification: Create workflows
Users wouldn’t be able to subscribe to this on their own, they would have to reach out to you or an admin to be selected as a recipient of this new action.
one thing to add regarding sending messages to Slack. When you want to send these messages to a private Slack channel, you need to invite the user “@HubSpot” in Slack to that channel.
