Please allow me to add some highlights here:
As for your native application, unfortunately, we can’t fix it for you. Please allow us to highlight that all our products (both templates and plugins) are web products firstly, so they work properly in web applications. There is no guarantee that any plugin will work in the native application ( especially with foreign services).
For this reason, the strange behavior of the plugin on some devices could be reproduced by incompatibility.
From this message, I can understand that issue is not with the plugin, but with devices. I don’t mean that they are incorrect, but they are exactly the error’s root cause.
As I demonstrated to you in my previous messages and in our previous communication, I was not able to reproduce this issue ( on the web version of your application), and every time and from any device, the plugin worked correctly and I was signed in on our Demo Page, and your Application.
We downloaded your application on 4 different devices (iPhone 13 Pro, iPhone 11 x2, and iPhone 7).
For 3 devices, we were able to sign in with Apple. However, on one device we were able to reproduce your issue.
After some research, we defined the issue.
Please note that the latest iOS version is really buggy and there are a lot of complaints regarding different functions ( we are facing troubles every day right now). One of the reasons, that could be related to your issues, is the AssistiveTouch button: iOS 16 update triggered AssistiveTouch issue, but there's a fix.
While waiting for the official patch, there is a potential workaround that might solve the issue. Basically, all you need to do is toggle the AssistiveTouch feature on/off.
“Settings” → “Accessibility” → “Touch” → “Assistive Touch” and then turn it on again.
In our case it was helpful.
Please try it and let me know about the result.