I cannot change my ingame name to what i want it to be

What happened:

I tried changing my ingame name to “iyfBrainBug” which is the nickname i always use. It says “Choose a different name”

What was SUPPOSED to happen:

It was supposed to change my nickname to “iyfBrainBug”

Steps to reproduce this issue:

  1. My Account
  2. Change name
  3. Type “iyfBrainBug”

If the name interferes with some sort of curse-filter i would really love it if you could change it manually <3

maybe someone else already has that name for whatever reason