PayPal Express not appearing on Product Detail page

I am trying to implement the PayPal express plugin on my shop, all options are selected for the PayPal Express plugin settings (including „…detail page“ of course) and the button seems to appear in every location (…cart, …off-canvas cart, …login, …listing) except on the product detail page itself.

How does the plugin work? Is it looking for a certain div class name that I might be missing?