Enable field workflow based on formula field not working

Enable field workflow based on formula field not working

I have a formula field with an IF statement that returns either "1" or "2"

I need to enable another field based on if the result of the formula field is "2"

I have created the workflow, and the field is disabled by default, but when the result of the formula field shows "2", the field will not enable.

How do i fix this?