WooCommerce Expert Needed for 404 Error

I'm using Theme A for my WooCommerce website. The issue I'm facing is with the product page and category page showing a 404 error. I haven't recently updated any plugins or WordPress, and I'm currently managing my website's permalinks using WordPress default settings.

Key Requirements:
- Experience in troubleshooting and fixing WooCommerce 404 errors.
- Proficiency in working with Theme A for WooCommerce.
- Strong proficiency in managing WordPress permalinks.