Woocommerce causing 403 error on entire website

Hello,

I have a 403 error affecting the entire website as soon as I switch on Woocommerce. Initially the index page shows, but once I get the 403 on another page, the index page also stops working, and sometimes even the backend.

It doesn’t seem to be a conflict with another plugin; I’ve tried deactivating everything, and even when Woocommerce is the only plugin I activate, the site is one big 403 error. Needless to say I’ve deactivated it at the moment to keep the rest of the website online.

My installation, theme and all plugins are up to date. I’m not sure what to look at, as Google’s answers don’t really go beyond “find the plugin”. I first noticed the issue when I was trying to authenticate my domain for Mailerlite (by adding DKIM and SPF records that I’ve since removed again). Could that somehow have affected Woocommerce functionality, or was that just coincidental timing?

I hope someone can help me figure this out. Thanks in advance!

The page I need help with: [log in to see the link]