No tax class setting for new product type in M2

Hi, we have had a new product type developed for our M2 store which is based off a Bundle product, but hides its contents. This works well, but all products of this new type have no tax being applied and there is no Tax Class option in the admin setting for these products so I cannot set them to be ‘taxable goods’.

I have identified the catalog_eav_attribute entry for tax class and added our new product type into the ‘apply_to’ value, but still don’t get the option to choose a tax class in the product settings. Is there somewhere else that I should set this up in order to be able to control tax class for this new product type?

thanks