I logged into your public key. You have a space at the end. Remove the space and it will work as expected.
You can verify for yourself.
https://nostrplebs.com/.well-known/nostr.json?name=berganjamie
That public key is the HEX of your key.
npub17pcacfrthd6p6tznq8tg22kysrj2x050jlnzfrr8uukvkewd4qjscdj95v
f071dc246bbb741d2c5301d6852ac480e4a33e8f97e6248c67e72ccb65cda825
Discussion
I saw that and changed it. I still get @berganjamie behind my name. It doesn't really matter, just wanted to be one of the cool kids with nostrplebs.com😁
You can, you just need to remove the space. I logged in again and I still see the space. Go remove it.
Honestly, client developers should do some field validation here. You shouldn't be able to enter an invalid character here.