It is possible to comment on blogs through Bloglovin if the blog has the right settings and allows commenting through Bloglovin. Only the owner of the blog can manage these settings.
If your readers are having trouble commenting on your blog, and your blog is hosted by Blogger, then go to the 'Dashboard' > 'Settings' > 'Posts and Comments'. Make sure the 'Comment Location' is set on either 'Embedded' or 'Pop Up Window'.
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