Reader: allow members of a private site to follow a tag or category-specific feed

[formosattic]

Originally raised in p5PDj3-2pU-p2

Following a tag or category feed is possible with public sites.
Note: we do need to manually add /rss at the end of the URL in order for the Reader to follow the feed. For example, https://en.blog.wordpress.com/tag/reader/rss works but if we just enter https://en.blog.wordpress.com/tag/reader/, the Reader will add it but will actually end up following https://en.blog.wordpress.com).

With a private site, even as a member of it, it'd be logical to be able to follow a tag or category feed as well but that's not the case. Trying to do so will return error Sorry, there was a problem following http://zzzzzzzz.wordpress.com/tag/fruits. Please try again.

However, members of the private site can follow the the main site URL.

[github-actions]

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[github-actions]

This issue is stale because it has been 180 days with no activity. You can keep the issue open by adding a comment. If you do, please provide additional context and explain why you’d like it to remain open. You can also close the issue yourself — if you do, please add a brief explanation and apply one of relevant issue close labels.