It is not a vaccine, but a biological weapon, designed to interfere with the immune system and cause catastrophic long-term damage to the organism. That is why the jib-jab is 'failing to immunise' - it is not an immunisation tool.
Here's a good list of points about the facts behind the mainstream headlines and the agenda https://off-guardian.org/2021/09/22/30-facts-you-need-to-know-your-covid-cribsheet/ which might help answer the deeper question of 'Why?' - it's super important to have a panoramic and deeply-informed view about what's going on with this whole hoax.
Blessings!