It was mandatory for many within government, like the military. Lawsuits are already being filed on that instance, I think.
Most other mandatory compliances were put forth by the private sector under strong recommendations, bordering duress, by the government.
Regardless, the government did indeed mandate the vaccine for anyone that they could which totaled enough to rack up a slew of lawsuits as discussed in the video.
In September 2021, Biden announced the Biden administration COVID-19 action plan, a six-point plan of new measures to help control the pandemic, which included new executive orders and regulatory actions to effectively mandate vaccination for COVID-19 among a large swath of the American workforce. Executive orders were announced directing all federal agencies to mandate the vaccination of their employees (with exceptions as required by law, and no option for regular testing in lieu of vaccination)[31] per guidance to be developed by the Safer Federal Workforce Task Force, and all future government contracts to include a clause requiring compliance with guidance to be developed by the Safer Federal Workforce Task Force (likely to include a similar mandate).[31] The administration set a November 22, 2021 deadline for most federal employees to be fully vaccinated and a January 4, 2022 deadline for federal contractors to be vaccinated.[32]
In September 2021, the employees of all federally-funded Medicaid and Medicare-certified health care facilities, and Head Start program facilities, were required to be vaccinated, as ordered through the United States Department of Health and Human Services (HHS).[33][34][31] Companies with more than 100 employees could either require vaccination for all (and give their workers four hours' paid time off for their vaccination appointments); or require any unvaccinated employees to wear masks and be tested weekly for COVID-19, according to an Occupational Safety and Health Administration (OSHA) Emergency Temporary Standard.[35][36] These two policies together —federally-funded healthcare facilities and large companies— would apply to 100 million workers and were scheduled to take effect on January 4, 2022.[32]