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Powershell/PowerShell-Office365Admin/OneDrive/ResetOneDriveQuotas.ps1

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+# Retrive a list of all OneDrive for Business sites, check their size and reset it if it is less than the default
+#
+# Requires the Sharepoint Online PowerShell module to be installed
+#
+
+# The name of your Office 365 organization
+# This can be found in your Sharepoint URL before the '-my', eg: https://thecompany-my.sharepoint.com/
+$spoTenantName=''
+
+# Connect to Sharepoint Online
+Import-Module Microsoft.Online.SharePoint.PowerShell -DisableNameChecking
+Connect-SPOService -Url ('https://' + $spoTenantName + '-admin.sharepoint.com')
+
+# Create the common base URL for OneDrive for Business
+$spoBaseWildcard = 'https://' + $spoTenantName + '-my.sharepoint.com/personal/*'
+
+# Get the default quota for the tenant
+$defaultQuota = (Get-SPOTenant).OneDriveStorageQuota
+
+# Get a list of all 'personal' sites (e.g.: OneDrive for Business sites) within the tenant
+$usersToReset = Get-SPOSite -Limit all -IncludePersonalSite $true | Where-Object {$_.Url -like $spoBaseWildcard -and $_.StorageQuota -lt $defaultQuota}
+
+# Get a list of all 'personal' sites (e.g.: OneDrive for Business sites) within the tenant
+foreach ($userToReset in $usersToReset) {
+    Write-Output -InputObject ('Resetting user ' + $userToReset.Owner)
+    Set-SPOSite -Identity $userToReset.Url -StorageQuotaReset
+}