"Prohibited" EA ID

Long story short, I want to change my username to "miramira," but when I try to do so, I get an error message that says "ID contains a prohibited word or character."

Mira is just my name, it can mean "look" in Spanish, but I've never heard it as a bad word, and I've used "miramira" in two other EA IDs (as seen in my current ID), but for some reason this error is specific to "miramira" by itself. Looking at all the other reports of people being unable to use the IDs they want because of this error, it seems like a glitch and needs to be fixed. When I reached out to chat support about this, they said they had no information why the error is showing and I just have to chose something else.

"miramira" as a username is almost always taken, so I wouldn't be surprised if that's the actual reason why I'm getting this error, but could the error message at least say "taken" and not "prohibited?" Please help me understand, or correct the error messages.