(XID p8ac8x) The name of another account on this server has the same initial 8 characters as the given username (username of your account). Each username’s first 8 characters must be unique.Solution –
1. Make sure that the username for the account which you’re going to create should contain different 8 characters. Every account should have a unique 8 characters in the username.
2. Make sure – Require a username prefix on names of new databases and database users [?] – is Off in tweak settings.