According to this:
https://www.sky.com/help/articles/esim-sky-mobile-activate-and-install
It can take up to 30 minutes for the email to come through so make sure you have checked junk/trash/bin folders.
If it has been more than 30 minutes then according to this link you will need to get in touch with Sky support:
https://www.sky.com/help/articles/esim-sky-mobile-fix-a-problem
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