@Amit Kumar Singh , Thanks for the reply.
Your understanding is correct. The iOS devices must be wiped before enrolling in Intune. Please check the Special migration considerations for more details.
https://video2.skills-academy.com/en-us/mem/intune/fundamentals/migration-guide-considerations
In addition, Intune provides a detailed migration guide for migrating to Intune from other MDM solutions. We can learn more about this guide by clicking the following link.
https://video2.skills-academy.com/en-us/intune/fundamentals/migration-guide
Due to the wipe in Airwatch, based on my research, it seems we can use Enterprise wipe in console. For the method to automatically do this. I don;t find. it. you can contact Airwatch support to see if there's such method.
https://subscription.packtpub.com/book/application_development/9781784391676/6/ch06lvl1sec51/un-enrolling-a-device
Note: non-microsoft link, just for the reference.
Hope it can help.
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