This question may seem a bit over-anxious, but want to make sure that I'm as polite and correct as possible. I've been communicating by email with an HR about my hiring and relocation process. The HR has a first and a second name (as far as I understand), as well as last name. At first I referred to HR by her first name, but then she clearly signed her email with her second name. The HR is located in Norway.
Is it appropriate to politely ask how HR prefers to be addressed by name, or should I just start addressing her by her second name instead? Both situations appear somewhat uncertain, but I think it is better to clarify such things as early as possible.