None.
The addition of a user to a DA Customer is based on the user's login name, i.e. the LDAP SAM account name. Therefore, if a login name already exists in the DA Customer and belongs to a user that was recently deleted from AD, this login name will not be associated to a new user in AD having the same login name.
DA should typically allow this function 30 days after the original user account's deletion. In the event a new user with the same login name needs to be added to a Role within the 30-day period, the remediation steps require editing the affected user's entry in the Customer database to indicate the user has been deleted from AD, thus allowing the new user to be selectable for Role Assignments.
Please edit as indicated and run the following queries against the DA Customer database, one at a time, with output to spreadsheet (Right-click in the results of each output section | Select All | Right-click in the results again | Copy With Headers | Paste into a new spreadsheet in Excel):
1. Obtain the information for the login name in question:
DECLARE @UserLogin nvarchar (100) = 'rsmith'; -- Edit login name in question here
SELECT [Customer_Database] = db_name(), *
FROM tblPrincipal
WHERE PrincipalLogin LIKE '%' + @UserLogin + '%'
ORDER BY PrincipalID;
2. Obtain the information for the user making the database change (this can be the Vault Service Account):
DECLARE @UserLogin nvarchar (100) = 'vsa'; -- Edit login name for user making the change here
SELECT [Customer_Database] = db_name(), *
FROM tblPrincipal
WHERE PrincipalLogin LIKE '%' + @UserLogin + '%'
ORDER BY PrincipalID;
Then contact Technical Support for assistance and provide the output of the above queries for review and compilation of the applicable remediation steps.