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  1. I have a account/blog. But when I want to leave a comment on someones blog I get ERROR: Invalid username. What is going on here

  2. So-called blog and the platform have no common backend (and therefore no single sign-on option). In general, you don't need to login to leave a comment on a wordpress (.org or .com) blog, but, if a particular blog requires to be logged in in order to leave a comment, you'll have to get a username and password from the blog admin of that particular blog.

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