Please keep in mind that you may need to reset iMessage after installing your eSIM. You can do so by following the steps below:
Go to Settings on your device
Go to Messages
Toggle iMessage OFF
Toggle iMessage back to ON
Tap on Send & Receive
Uncheck your number and make sure your email address is checked. This way, you’ll be able to send and receive iMessages with only a data connection.
When you no longer have a need for your eSIM, and wish to switch back to your Primary SIM, you can do so by following these steps: Settings > Messages > Send & Receive and check your phone number again.
If you have any questions, please feel free to contact support.
