Publisher is EE6 compatible, but it does not support the Fluid field. Please do not contact asking when support will be available.
If you purchased an add-on from expressionengine.com, be sure to visit boldminded.com/claim to add the license to your account here on boldminded.com.
Ticket: Include custom field values in Approval email template
|Add-on / Version||Publisher Lite 3.7.2|