ODBC Data Reader HasRows=True but No Data - powershell

Question

I'm connecting to an Access database through ODBC using Powershell, reading data from Access to convert it to another database. I have one query that is causing me problems because although HasRows returns True, when I attempt to loop through the reader, it acts as if it is at the end of the reader. Here is the code I'm using
$FMconn = new-object System.Data.Odbc.OdbcConnection
$FMconn.ConnectionString = "DSN=AccessFileMaker"
$FMconn.Open()
$FMCmd = $FMconn.CreateCommand()
$FMCmd.CommandTimeout = 0
$sql = "
SELECT
fd__folder.id as folderid
,fd__folder.folderletter
,wl__wallet.id as walletid
,wl__wallet.walletnumber
FROM
fd__folder
INNER JOIN wl__wallet
ON fd__folder.id_wallet = wl__wallet.id
WHERE
fd__folder.folderLetter > ''
"
$FMCmd.CommandText = $sql
$Reader = $FMCmd.ExecuteReader()
if ($Reader.HasRows) {
while ($Reader.Read())
{
$folderID = $Reader["folderid"].ToString()
$folderletter = $Reader["folderletter"].ToString().TrimEnd()
$walletID = $Reader["walletid"].ToString()
$walletNum = "Wallet " + $Reader["walletnumber"].ToString().TrimEnd()
(other code here to insert data into the other DB but irrelevant to the problem)
}
$Reader.Close()
}
As I step through the code I get to the while($Reader.Read()) and it immediately steps to $Reader.Close()
The query runs find in Access as is and returns 56115 records. I've used this same process to extract other records from Access (although none of the queries involved a join). So why can't I loop through the records of this query if the Reader has rows? Any help debugging this would be greatly appreciated.