Missing categories for Custom Taxonomy and Custom Posts

Your Knowledgebase and Articles CPT slugs are capitalized. This is not allowed – see the codex.

(string) (required) Post type. (max. 20 characters, can not contain
capital letters or spaces)

Change these to all lower case, both in the first parameter of the register_post_type and in the second parameter of the register_taxonomy, and you should be good to go.

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