Question with URL structures related to custom post types

Hello,

Thank you for contacting Rank Math and bringing your concern to our attention.

We’ve checked your site, and you also have visa-assistance post type, which conflicts with the rewrite slug you used in your location post type.

Here’s a similar case you can check as well:
https://wordpress.org/support/topic/setting-custom-rewrite-slug-gives-404/

Hope that helps.