I recently commented on a blog post that had some errors. The confirmation came to my email asking me to follow your staging blog. It seems like this is an error on your end.
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The link in the email and at subscribe.wordpress.com is correct and goes to the regular blog not staging. I guess just the message text is wrong.
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Blog Name: WPMU DEV Staging Blog
Blog URL: https://staging.wpmudev.org/blog
This is not a big issue for me. I am passing it along because I thought you might want to fix it.