This is fine — simply go through the process again but put the correct name, and it will sort itself out.
To play on the server, you must be an active subscriber to either swag_charhar or unfunnyttv.
Simply go through the registration process twice — one for Bedrock and another for Java. It will add both accounts.
Please allow at least an hour for the system to add you to the whitelist. It may take some time for your status to be updated.