I have two columns that are on my form, how do i prevent them having the same value using the Forms features?

For example Owner and 2nd Owner.

This article explains how to restrict users from selecting the same values in two fields using Column Validation feature.

Steps to Restrict Users from Selecting the Same Values:

Step 1: Access Column Validation:

2. Select Column Validation

 

3. In the Column Validation settings, choose the field you wish the rule to apply to.

Step 2: Set Up the Rule.

• Validate Value: does not contain
• Insert Token: Click the "Insert token" button and choose from the list of columns
• Otherwise, show: The message that will be displayed when the same value is used
  
  

 

Results:

 

Repeat for any other validation