How do you use the ~Contact.FirstName~ format on custom fields? For example if my Custom Field is “Model Number” I’ve tried ~Contact.ModelNumber~, but to no avail, it does not work.
You need to insert an underscore after the period.
Assuming ‘ModelNumber’ is the correct database name.
If you go into an email and choose the ‘merge’ option, you can insert the merge code and check it exactly.