I'm using Livefyre comments (3.17) and Relevanssi (3.1.4). When I search for individual words, Relevanssi gives me results that include results from the comments, so the comments do seem to have been indexed and searchable. When I use quotation marks to search for phrases that occur in a comment somewhere, though, I'm told there are no results. Phrase search does work if the phrase occurs in the body of a post.
Any ideas? Many thanks in advance, I can't seem to find any other descriptions of this behavior anywhere and am stumped.