Not kidding. Here's what was in the email I got:
I appreciate your time and patience while I had a chance to get to your case regarding the issues you are having posting within in-game chat in Battlefield 5. My name is John and I am the EA…
I have this issue too. It's because the chat filter has detected a forbidden word in my nick.. I actually contacted EA support and they confirmed it. I've had my nickname for 20 years now and don't really feel like changing it.