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First thing, you have selected your rules in the Quick action bar, which means Validation issues appear in the Quick Action Bar on the left in Content Editor. To see the error while saving the item, you'll need to select the rule in Validation Bar for the field: Then, you will need to pass the Fatal Result parameter in the rule item (/sitecore/system/...


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I was able to make it work by inverting the logic for the checkbox field. Instead of using is empty I used not equal to 1


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You are able to create a custom validation message item on sitecore. First you need to create an item on /sitecore/system/Settings/Forms/Validations. After you need to create a custom code on Visual studio to render the message with the rule that you want, for example, field is required. After that you need to include your validation item on " Allowed ...


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