Quickly find out all the Distribution Groups a user is a member of with a few lines of simple PS code.
$Username = "johnsmith@hiepic.com"
$DistributionGroups = Get-DistributionGroup -ResultSize unlimited | where { (Get-DistributionGroupMember -ResultSize unlimited $_.Name | foreach {$_.PrimarySmtpAddress}) -contains "$Username"}
$DistributionGroups
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