Login message error on iOS with iframe embedded version of Bubble app

I have embedded a Bubble app using an iframe and other methods to see if that was the problem. However, when I try to view the page on an iPhone 8, I get the message “Please log in to access this data,” regardless of the embedding method. I do not have any login requirements for the Bubble app. It also works fine on a desktop browser (Firefox, Chrome, and Safari). This is something distinct to iOS. I have the latest version of iOS. Any ideas what is up?

I had success using this code:

<embed src="https://yourappswebsite.com/page-with-form-on-it" style="width: 100%; height=1200px;" scroll="auto"></embed>

No success with <object></object> or <iframe></iframe>