CiviCRM is defaulting to uppercase path
Can you check the CMS Settings https://yoursite.org//wp-admin/admin.php?page=CiviCRM&amp;q=civicrm%2Fadmin%2Fsetting%2Fuf&amp;reset=1 and see what you see?
I suspect it looks like:

Can you also check the WP Page 'CiviCRM'  I suspect the slug is not 'civicrm' lowercase.   These values must match in order for the urls to resove.