You need to be using one of these functions to display a list of tags associated with the post:
the_tags()get_the_tag_list()get_the_term_list()
Otherwise the check will fail.
If you’re building this theme for use with a project that doesn’t need tags, don’t bother adding support. If you’re intending on uploading it to WordPress.org for review, then you need to add support for tags.
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