Wrong username warning or error not showed

Description:

• Whilst creating new account on rc if the user provide wrong usename
• no error message or warning is being given
• Even account is not made but don't know what went wrong

https://github.com/RocketChat/Rocket.Chat/assets/133019575/5b62dd37-cea4-4453-863a-731400c5f901

Steps to reproduce:

1. go on create new user
2. provide wrong username
3. no warning is given there also if you click save even than no error message is being shown

Expected behavior:

• should show warning in case wrong username
• must give error incase worng username is provided and clicked on save

Actual behavior:

• don't now what went wrong while creating account in case wrong user name is being provided

Server Setup Information:

• Version of Rocket.Chat Server: 6
• Operating System: win 10
• Deployment Method: production + wsl 2
• Number of Running Instances: 1
• DB Replicaset Oplog: true
• NodeJS Version: 14
• MongoDB Version:6

Client Setup Information

• Desktop App or Browser Version: production
• Operating System: win 10

Additional context

Start by reproducing the issue in the create-new-user flow using the reported steps: enter an invalid username and select Save. Trace the flow to determine why neither inline validation nor a save error is shown; done means invalid usernames produce a clear warning or error and account creation failures are explained to the user.