RSS feed URL question

Today, my daily blogpost wasn’t delivered by Mailchimp. I went to see what the problem is and it said my RSS feed wasn’t correct. But it’s the one I’ve been using for 2 years:

https://www.neversaydiebeauty.com/feed/

Unfortunately, I have the free version of Mailchimp with no support so I can’t figure out what’s wrong. Their support library suggests maybe my feed was changed by the administrator but that doesn’t make sense to me.

Any ideas on what else I can try? Thank you in advance for any ideas