Notify HR of your desired paternity period and tell them it was offered by the CEO. If they say anything but yes, forward their response to the CEO and ask abo

Notify HR of your desired paternity period and tell them it was offered by the CEO. If they say anything but yes, forward their response to the CEO and ask about why HR is unaware of the "wonderful" paternity policy offered to you in the interview. Keep good records. If they fire you over this, talk to an employment lawyer.