Hello. So you are not getting any e-mails and in invoice list are green checkmarks? Or there are red crosses? Do you receive also other e-mails sent by Joomla? Also in automatic mode are sent only orders that were modified in last 24 hours (it is prevention of massive sending for example when you install vm invoice or import old orders), so that may be cause of problem. If you open and save some order, it may be sent then automatically.
If none of this is solution, best would be if you send us your admin credentials to
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along with link to this topic. Thanks.