element.classList.remove(“u-hidden”) does not work

I am using the following code:

 var el = document.getElementById("MY_ITEM");
 el.textContent = "TEST";
 el.classList.add("success_message");
 el.classList.remove("u-hidden");

Everything works up until the line 4. No error message, just that class u-hidden does not get removed from the element so I cannot see it in the browser. Is there a better way to do that?

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