Site with WooCommerce section moved to HTTPS – all pages except home and main store are 404s

With info provided, I can see a few things it might be:

Rewrites

Review your .htaccess rules, the rewrites (arguably) don’t do a lot of work on the home page – which may be why your issue is inner-page only.

Run a flush or visit your wp-admin > Settings > Permalinks and [Save]. The rewrites which WooComm may be using may be doing something unexpected.

Database

It could be missed http database values (with WooComm) you can do a find and replace on the database. With wpcli you can see what’s non-https with

wp search-replace 'http://example.com' 'https://example.com' --dry-ru

Theme

If you do believe it to be your theme, though unlikely unless custom theme, you can browse the source code of your theme and look for hard coded values, with command line:

grep -r 'http://' /path/to/wordpress/wp-content/themes/

Debug

Be sure to turn on WP_DEBUG and check your servers error logs incase the 404s are just hiding a simple php or setup error.

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