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The reason is explained in RFC 4291:
The motivation for inverting the "u" bit when forming an interface
identifier is to make it easy for system administrators to hand
configure non-global identifiers when hardware tokens are not
availabl...
Having the same issue described above. By the way, the email I received contains the same exact username and password than that quoted by Khalid. Maybe the issue is that the auto-generated email is not correctly templatized?