I create a formula field to get account email onto child custom object CCM email but to send an email alert this formula field is not available in the list of email alert so i created a new email field the i want one more workflow for this field update

formula is NOT(ISBLANK(CCM User)) but it is not firing as it is a formula field gets copied directly there is not insert or edit criteria met.

Can anyone help me how ti update this new email field from thia formula field?