405 on existing route

Attached you’ll see 5 images.

Two for routes: routes/custom.js (custom routes) and routes/core.js (routes created by factory)
One for the service: services/credential-user.js
One for the controller: controllers/credential-user.js

I’ve got a custom route POST credential-users/plz which calls credential-user.customCreate. customCreate is basically the same as the default/core create method with a console log (as you can see).

Creating a POST request to /credential-users/plz returns a 405 error. What am I doing wrong?

Thank you for your time and assistance!

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yarn strapi content-types:list

api::whatever.whatever.yourFunction