Blog posts return 404 when adding blog title to permalink structure

Hey all,

I’m getting a 404 not found on my posts when I add the blog title to the custom permalink structure for some reason. My client would like (for apparent SEO purposes) the blog title and the category in the blog post url. For example, my blog title is “Whats Happening”, so I’ve structured this way /whats-happening/%category%/%postname%/ and in order to remove the word “category” from the category URL I’ve added “whats-happening” to the category base.

My clients needs are pretty specific in that they need the urls to be structured with the blog title, category name, and post name. For example, /blog-name/category-name/post-name

I’ve tried quite a few variations and plugins but unfortunately no luck so far. Any ideas for me? Thanks so much in advance!