Sending Customer Emails

In this thread from 3 months ago: https://wordpress.org/support/topic/no-payment-no-email/
a user had asked about customer emails not being sent.

I have used [accept_stripe_payment_checkout] on the thank you page (which works) and have done multiple tests (with muliple shortodes) in test mode using Stripe API test keys.
The test sales show up in Stripe… but for some reason confirmation emails never get sent to the customer.

I have the checked: ‘Send Emails to Buyer After Purchase’
If checked the plugin will send an email to the buyer with the sale details. If digital goods are purchased then the email will contain the download links for the purchased products.

In the next field, the ‘From Email Address‘, is there something we need to setup outside of the plugin for that to work?
Its the only thing I can think of.

Any knowledge on this would be really appreciated thanks.