The vaccines were primarily deleveloped for SARS1 and MERS, and then adapted to an early sequenced genome of Alpha/Beta variants provided by the Chinese Communist Party in January, 2020.
Since then, Covid-19/SARS2 has evolved faster than our vaccines. Nature and natural selection are occuring at a rapid pace, on a global scale. This is a virologist's nightmare.
Because of evolotion and natural selection, vaccines that were hoped to prevent infection, are only now effective against hospitalization and death. Given enough opportunity and statistical math and probabilities, the current vaccines may be even less effective by Spring 2022.
The viral genie is out of the Wuhan lab, and in the wild, doing what Nature does best - evolving and adapting to survive and dominate. We've fallen behind in a race against mathematics.