Posts or Pages not loading/404

Hello I just created a new site like many times before, didn’t do anything different, yet for some reason this time only my main page loads. Any posts or pages just go to a 404. I have permalinks set to custom with /%postname%/. I tried the post name option too. Nothing. I have the Yoast SEO plugin installed so I don’t know if that’s causing any conflicts. I have no idea how to fix this.