You are attempting to create a user with a domain logon that is already used by another user

Today when I was creating a new user for testing I got this 'You are attempting to create a user with a domain logon that is already used by another user.'


Let's I was creating 'crmtrainee'

Solution:

1) Connect to CRM 2011database

2) Query 'select fullname, firstname,lastname,domainname,isdisabled,isdisabledname from filteredsystemuser where domainname like '%crmtr%' '

3) Find the record check if it is disabled (isdisabled =1).

5)If record is disabled .Go to user select disable users view, Enable them.


It solved my problem :)

Hope it helps 

Yusuf