Unable to Make Comment Box Required Using VBS in Individual Compensation

Summary:

Hello Experts, I am trying to make the Comment field is mandatory in the Manage Individual Compensation page using Visual Builder Studio (VBS), but the validation is not triggering. I need guidance on how to correctly enforce this requirement.
Content (please ensure you mask any confidential information):

I have a requirement where the Comment box in the Individual Compensation transaction must be required before the user can submit the transaction.

I attempted the following:

• Added a VBS validation rule on the Comments field
• Used $fields and $objectContext to check the value
• Tried both Condition and Validator rules
• Verified that the rule is attached to the correct object (IndividualCompensation)