Iframe Embed widget shows a blank page when embedding a Google Maps review page

I’m trying to add our google maps review page as an iframe to save people an extra step if they want to leave a review within our form. However, when I add it the page is blank. I’ve tried http and https but it hasn’t made a difference. 

Is there another way to accomplish this task (maybe a pop up window inside the form) or something I can change to get the iframe to work?

We would like to apologize for any inconvenience. May we ask for the link to your Google Maps review page that you are trying to embed in your form with the Iframe Embed widget, please?

Also, can you tell us which form in your account are you currently working on, please?

We will wait for your response.

The form is:
http://forms.wiseguyrepair.com/wiseguyrepair/sweepstakes
Our review page is:
https://www.google.com/#q=wise+guy+computer+repair&lrd=0x89c6c63c52c21f5f:0xa799b62ba5ebfee9,3
(I’ve tried other link variations for it as well but none have worked)
As you can see on the form...yelp works but for some reason google does not.
...

Apologies for the inconvenience. Some web resources have restrictions in regards to iframe embeds. Google is one of them, so it is not possible to embed that web page via vidget or any other iframe. 

Thank you, is there any way to make a pop up instead so there’s not a
psychological barrier of “leaving the form” for the user?
...

If Google has restrictions when it comes to having their sites embedded on a web page using iframe, I'm afraid it would also be impossible to have it appear on a pop-up.