Granting SQL Server role in a remote server - sql

Question

I am working on an activity where I have a table (t1) in server1 which stores servername, userid and role information.
I created a PowerShell script to run on server1, collect these information from the table, connect to the remote server(servername) and grant the requested role to the userid.
Please find the script below:
$SQLServer = "Server1"
$SQLDatabase = "Db1"
$user = "select userid from T1"
$role = "select access from T1"
$server1 = "Select servername from T1"
<#store the table information in a text file for auditing#>
$Sqlquery = "Select servername,userid,access from T1"
$Test = Invoke-SQLCMD -Query $SqlQuery -serverinstance $SQLServer -Database
$SQLDatabase
$Test | format-list servername,userid,access| out-file "G:\EP\test.txt"
$SqlConnection = New-Object System.Data.SqlClient.SqlConnection
$SqlConnection.ConnectionString = "Server = $Server1; Integrated Security =
True"
$SqlCmd = New-Object System.Data.SqlClient.SqlCommand
$SqlCmd.CommandText = $SqlQuery
$SqlCmd.Connection = $SqlConnection
$SqlAdapter = New-Object System.Data.SqlClient.SqlDataAdapter
$SqlAdapter.SelectCommand = $SqlCmd
$sqlSrv = New-Object 'Microsoft.SqlServer.Management.Smo.Server'
"SQLServer\Instance"
foreach ($login in $user)
{
$login.AddToRole($role)
}
$SqlConnection.Close()
While running the above code, I see the following error:
Method invocation failed because [System.String] does not contain a method named 'AddToRole'.

Answer 1

Where is the $User in foreach ($login in $user) defined ?
Its null and foreach iterates to null (expexted behaviour) and $login becomes nothing here.
You might have missed setting $user here.