I'm having trouble adding an embedded sms form with klaviyo on my SHopify store (theme impulse)

[mytoywagon]

Hi 

I am embedding a klaviyo form for sms sign-up. For some reason, the form is showing up on the shopify url but not my original domain: 

This one works: 

https://my-toy-wagon.myshopify.com/pages/sms-sign-up

This one doesn't:

https://mytoywagon.com/pages/sms-sign-up

Can you tell me how to fix this? 

Thanks!

Irfana