RSS Feed missing? Need help please

Hey, I have 3 wordpress sites, out of the 3, 1 of the RSS feeds isn’t working/isnt there.

The url is https://www.licensed-practicalnurse.com/feed/ (Im getting a 404 error pretty much)

Anyone know how to fix this?

One of my other sites, https://www.work-out-plans.com/feed/ , you can see that the feed shows up perfectly. I have no idea how to fix this and any help is appreciated, I have tried different support posts but they appear to be slightly different problems.