Hi Arthuzad,
Automations/Business Rules - look at them as backend, processed by server - they give you possibility to use SQL, and read the database.
Form Rules - this is a frontend - here you can use JS, and everything done in a form rule happens on the browser instance of specific user.
Alert - is possible to use as a Form Rule, it's on front-end, thus it's not possible to use Alert inside of Automation.
If you want to check if the form is filled correctly but on the server side, you should use Validate Form action*
*https://docs.webcon.com/docs/2025R2/Studio/Action/Form/Action_ExecuteValidationQuery