Apparently, WordPress doesn't want people to easily let their users (Multi-site or otherwise) choose their own passwords when they register, or be able to log in immediately afterwards without having to confirm their email first.
I'm putting this here because it took me a LONG time to find these simple (free) plugins to do this, so maybe this will make someone else's life easier. 🙂
How To Disable Email Confirmation for Registration
Download: Remove Email Verification
How To Let New Users Choose Their Own Passwords When They Sign Up
Download: Signup Password
Just install and activate, and they should work immediately.
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