Allow badges to be awarded in this category does not refer to the solved plugin in particular, but to all the Discourse badges in general. You do not have to check anything, just that the plugin is enabled globally or on the individual categories as @awesomerobot explained to you here https://meta.discourse.org/t/added-latest-version-of-plugin-solved-checkbox-for-op-is-not-showing/79128/3?u=dax
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