Use email address as username

Original Question/Issue: 

ERROR 

Invalid username. username can only contain numbers, spaces, hyphens, periods 

underscores, and letters from Latin alphabet (A-Z, uppercase and lowercase) or 

should be a valid email. username also cannot be admin or superadmin. 

Environment:

• Product -  FileCloud
• Version -  Online Latest
• Platform - FileCLoud Online
• Application - Web

Steps to Reproduce:
Create a user with email address

Error/Log Message:
ERROR
Invalid username. username can only contain numbers, spaces, hyphens, periods
underscores, and letters from Latin alphabet (A-Z, uppercase and lowercase) or
should be a valid email. username also cannot be admin or superadmin.

Cause: Settings

Resolution/Workaround:

Notes: https://www.filecloud.com/supportdocs/fcdoc/latest/server/filecloud-administrator-guide/filecloud-site-setup/user-settings/new-account-creation/allow-email-addresses-as-usernames