iframe is not displaying my desired external web page

Hi!  

I'm trying to embed this external URL on my Squarespace website, but it just appears as a blank grey screen for me.  Can anyone help me display the below URL in iframe?  

URL To Display in iframe:  https://shenandoahagtech.adalo.com/reports?uuid=0488266d-17ca-476d-9eb4-961b39afd82f&target=cvfrtl9gd5j1opa0gqg0guz7b&params={}

OR this is the root URL:  https://shenandoahagtech.adalo.com/reports?uuid=0488266d-17ca-476d-9eb4-961b39afd82f

I've tried several different iframe configurations, but cannot get this URL to display in my Squarespace page.  

Some possible issues could be: 

1.  I know there are ampersands (&) in the URL and that may be breaking things?

2.  Perhaps there are some permission issues I need to set or allow before this page can be displayed?  This page is an output page of another project I'm working on in Adalo, but I don't need to authenticate or anything to just view this page in a regular browser, so why would iframe need extra permissions?

If anyone can help me with this, I would really appreciate it!  

Thanks!

Can you share link to page where you added the code?