404 on RSS feed

Hey guys!! This community has been so helpful with me so I’m sure you’ll point me in the right direction here ??
The very last thing I need to do for my site to be completely ready is add RSS feeds, and feedburner is my best bet to organise them. The first thing I should mention is that I’m using a plugin “gengo” to reorganise all my posts into various languages so this may be influencing the issue.
When I access the feed through https://www.irishpolyglot.com/feed in Google Reader I get all my feeds no problem, yet firstly no combination I try gives me the feed in separate languages (adding ?feed=rss2&language=en etc. as other gengo users do) and secondly no combination at all gives me ANY working feed in feedburner; they all return a 404 or give an empty page. What exact url do I have to provide? Strangely enough it works perfectly for the comments: I’ve tried also https://www.irishpolyglot.com/?feed=comments-rss2&language=en and language=fr, and they both work great in both GReader and feedburner, but https://www.irishpolyglot.com/?feed=rss2 by itself or https://www.irishpolyglot.com/?feed=rss2&language=en just give blank pages ??
Any hints would be greatly appreciated!
Many thanks! ??