RSS won’t validate/404

Hello everyone,

I’ve tried everything imaginable to get my RSS feed to work, but to no avail. It used to be there, but it hasn’t been in months.

I’ve done the deactivate plug-ins thing. I’ve used the fix-my-rss feed plug-in.

Yet feed validators keep telling me that my feed isn’t found. This is the specific error: https://beta.feedvalidator.org/

You can see the feed if you click on it on my website, but if you try to subscribe it won’t let you.

If anyone has any advice it would be most appreciated!

My site is https://www.firstgenerationu.org

Thanks,