The best thing to do is open a ticket to support it usually happens with other services is about limits and so. Open the ticket https://go.microsoft.com/fwlink/?linkid=2083458
as per this FAQ I think it answers your question https://docs.microsoft.com/en-us/azure/china/resources-faq if not let me know and we will find an answer for you.
there's a post for doing, from Office 365 to PST https://www.systoolsgroup.com/how-to/export-office-365-mailboxes-to-pst/
To open .etl file, open Event Viewer, right-click Saved Logs, click Open Saved Log, and then locate to the .etl file. Another way is using command “tracerpt”. Please refer the following article.
Tracerpt http://technet.microsoft.com/en-us/library/cc732700(WS.10).aspx
what do you mean by account ? A subscription ?