Marshmallow (or later) ROM that supports multiple users

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I am looking for a Marshmallow (or later) ROM that supports multiple users. E.g. So each user can have their own 'account' without other people being able to access it.

This feature was introduced in Android Kitkat. However, all the Marshmallow ROMS for Kindle Fire 2 I have tried seem to have this feature removed.

I would greatly appreciate any suggestions. Thanks!

 

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Just to double check:
Is there a technical restriction that prevents multiple users working on Marshmallow (or later)?

Thanks!