Hi Adam,
I think I may have identified the issue. I have reason to believe that it is the hosting platform – I have more than 50 sites on my server using Site Kit and about 20 of them uses WooCommerce.
This domain is hosted outside of my servers and the only one experiencing issues. I think I may need to ask the Client to reach out to them to resolve.
If you are able to assist with this, let me know.