powershell 脚本的目标是将数据库从一台服务器复制到另一台服务器，然后在目标服务器上执行一个简单的查询。当前用户对数据库服务器没有权限，因此在两台服务器上都创建了一个登录名，密码作为安全字符串存储在文件中：
$sourceServer = "ServerA"
$destServer = "ServerB"
$restoreUser = "replicationuser"
$encPass = Get-Content -Path ".\SecuredPass.spf"
$secString= $encPass | ConvertTo-SecureString -Key (1..16)
$restoreCredential=New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $restoreUser, $secString
Copy-DbaDatabase -Source $sourceServer -Destination $destServer -Database "MyDatabase" -SourceSqlCredential $restoreCredential -DestinationSqlCredential $restoreCredential -BackupRestore -NetworkShare "\\MyShare\Databases" -WithReplace -EnableException
$sqlQuery = 'select 1+1'
Invoke-DbaSqlQuery -Query $sqlQuery -SqlInstance $destServer -SqlCredential $restoreCredential
当脚本运行时，数据库被复制，但查询执行给出以下消息：
WARNING: [15:53:29][Invoke-DbaQuery] Failure | Property LoginSecure cannot be changed or read after a connection string has been set.
运行查询时应该怎么做才能使用凭证？