Can’t Find Categories in Block Editor (WooCommerce) using iZettle Plugin

I have installed the iZettle plugin.

I have managed to embed my iZettle Store, as well as the button and widget.

However, now i have updated my product categories in iZettle, the iZettle plugin in wordpress can no longer find any categories, it just constantly loads.

It appears to be able to cope when there are a handful of categories, but as soon as the categories become numerous, the plugin fails altogether.

I would desperately appreciated some help with this otherwise I would consider moving everything including POS to another provider.