I have a similar issue with 16" M1 Pro Max except before booting into install, it just keeps asking for my Mac password in a loop.
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Same issue. Anyone actually been able to get it loaded?
I'm on MacOS 12.0 Beta (21A5248p), MacBook Pro (13-inch, M1, 2020), tvOS 14.6 Beta AppleTV 4K
I have exactly the same issue - iPhone ll Pro Max, T-Mobile, e-simAll iOS 13 betas