I still haven't received one, I'll update this comment if I do.

-edit- I just received it at 2:42 pm pst

I got an email for a secondary account I had forgotten about at 4PM PST.

i haven't got an email yet either

Finally got it too (aprox 4pm PST).

Make sure you turn off Remote access in your device.

Probably can leave on local login (w/Ubiquiti acct) but should turn on 2FA