Bottom line: Pfizer has TWO "legally distinct" vaccines. Both are mRNA, but have "certain differences". The one that received FDA full approval was only the one available in Europe. On the same day this other vaccine received approval, Pfizer's U.S. version of the COVID-19 vaccine ONLY received an extension of the Emergency Use Authorization.

So they are mandating vaccinations based on approval of a vaccine that is NOT readily available to U.S. citizens.