First of all, brilliant module. It really works well, thanks for the effort. The following is purely intended to help out, not to criticize. Thanks for listening, hope this contributes. So here we go.
On the project page it states:
Once the module is enabled, you can configure the SKU pattern used for each of your product types on the main product type edit form (admin/commerce/products/types/product, for the basic "product" type). It is reccomended that you use the Token module to help with token entry, but it is not strictly required.
However this is not correct for D8, the correct link is :
admin/commerce/config/product-variation-types/default/edit
And it should be about product variations, not product types (in D8 / commerce2 parlance). Also Token is automatically installed if you use composer at least.
I do not know if the rest is still accurate or not, but reccomended is correctly spelled as recommended ;-)
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