Upgrade storage account to V2

Powershell

Get all storage accounts:
Get-AzureRmStorageAccount | Sort-Object -Property ResourceGroupName | Format-Table -AutoSize

Get-AzureRmStorageAccount | Sort-Object -Property ResourceGroupName | Format-Table -AutoSize

Upgrade storage account:
Set-AzureRmStorageAccount -ResourceGroupName O365Lab -AccountName o365diag -UpgradeToStorageV2

UI:

References: