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It’s possible your site is not able to send email at all?
Try the the Email Log plugin to sort out the cause. Install the Email log plugin an see if the emails are created and just failed to send or something else.
If the logs are displaying then you need to install an SMTP plugin on your site to send emails or contact server support for this. If you don’t see emails in the email log then create a support request on our site https://userswp.io/support/