Y’all need to go to a lawyer NOW. Have them draft up a letter explaining that you will sue, as an experimental vaccine cannot be mandated, violation of human rights, unconstitutional, etc.. And other language as appropriate.
Let them know their power is not all one-sided, and they will be opposed in court.
I might also suggest (since the Biden Admin has said a few months ago, they won’t require companies to collect/report jab-related injuries despite the existence of black-letter law requiring it), Section 1983 violations, deprivation of human rights under color of law.
That’ll get HR and Legal to pay attention.
Working on it!