@netpastor I have used the following very simple CSV format that was uploaded successfully, please note my OS Locale is set to an US one.
I have also attached the CSV in question.
If the above does not help, we will definitely need to take a closer look. If that would be the case, we'll need to convert this to a Support ticket, so please confirm your tenant ID (in a private message for security reasons), and also confirm I am allowed to attempt to upload your usage to the account 100002.
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