Permalinks and custom post type

My client asked for blog pages to be prefixed with /blog

I adjusted this in permalinks so I now have /blog/%postname%/

this works fine for my posts

I also have a custom post type and associated taxonomy which are now prefixed with /blog throughout.

I tried the following but it results in 404’s on my cpt pages

‘rewrite’ => array(‘with_front’ => false, ‘slug’ => ‘your-slug’)

I have visited the permalinks pages each time I make changes but it doesn’t help.

I have an extensive rewrite for my custom post type and taxonomy as I needed them to both share the same slug, I’m wondering if this is the cause.

I have seen a few people have this issue with permalinks /blog and custom post types, have tried those fixes but always get 404’s