Did you log in to the Sunrise Cockpit thing?
https://sunrise.ch/mysunrise
A week or two ago I was moved from UPC to Sunrise and as soon as I got the notification on my phone (and it showed as connected to the Sunrise network) I logged into the cockpit and clicked to convert to an eSIM.
A short while later I got this text:
"Dear customer, You have requested a transfer to a new eSIM profile for the mobile number 077xxxxxxx. For security reasons, we need you to confirm this using the link below: XXX
Your new eSIM profile will then be available as a QR code at sunrise.ch/mysunrise. If you have not requested a SIM change, ignore this text or call Sunrise customer service. Find out more at sunrise.ch/esim Your Sunrise team"