Memory issues for IOS, but not at all for Android

I've build an AR application in Unity which has worked fine on Android devices for a few months already, even older ones.

However, I'm currently in the process of deploying to IOS, and when attempting to test locally, Xcode gives me this error:

Job.Worker 0 (10) EXC_RESOURCE RESOURCE_TYPE_MEMORY (limit=1450 MB, unused=0x0)

I've found that this error occurs when an application uses too much RAM, so I've reduced all the texture resolutions significantly, but the problem persists. I cannot realistically reduce any more textures or any functionality, since it's simply needed for the app to work.

As I said, I've never had any issues with Android phones, even older ones, or before compressing the textures. So, I'm not convinced that it's a hardware issue.

I'm currently testing on an iPhone 7 using Xcode 12.2, the app was exported from Unity 2019.1.3. Does anybody know how I can fix this issue? I'm quite experienced with Unity but this is my first ever (and probably last, lol) IOS app.

Any help would be greatly appreciated :)