@Siya Kumari, Thanks for posting in Q&A.
Based as I know, for Android BYOD device, to enroll it into Intune, we will choose "Android Enterprise personally owned devices with a work profile" or "Android device administrator" enrollment method. Both the enrollment methods are done via installing Company Portal and signing in it. QR code will not be used. Here is a link with more details for your reference:
https://learn.microsoft.com/en-us/mem/intune/fundamentals/deployment-guide-enrollment-android
For iOS BYOD device, we will add the Apple MDM push certificate to Intune and also install company portal and sign in to complete the enrollment. So QR code is not used either. Here is a link with more details:
Hope the above information can help.
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