Ad approved but limited
I am using a trademark keyword "WordPress" on the headline. The full headline reads "Hire WordPress Developers" and it says "Approved but limited". I have a keyword that reads "WordPress Developers" will my add show in that cast
It is likely because of the Term "WordPress" as it's a trademarked term. For fully approved status, you have to get trademark approval from WordPress.
As an another option, you can use the term "WP Developers" or "Wordpress Developers". The abbreviation “WP” is not covered by the WordPress trademarks and you are free to use it in any way you see fit.
To know more on Approved (limited): Definition
Hope this will help.