Receiving error messaging using I-frame

I am currently using a trial of a designer plus account. Our team is trying to get a test up on our site we are building. We are receiving a message " Embedding not allowed for origin https://www.toronto-signage.com" even though we have toronto-signage.com and toronto-signage.myshopify.com in our whitelist. Can you suggest something to resolve this issue?

Did you try adding www. in front of the domains you are adding?