My sisters had the same experience. The sister with the J & J did not get COVID My other sister had a different vax. She has had COVID at least twice since vaxxing and I assume boosting.
I did neither, and had COVID for a month in 2022. In theory I should be immune.
I’m soooo angry...It took them two years before they told us that it does NOT prevent Covid...in any way....It just keeps you from dying...which doesn’t make sense either since the death rate was like 0.012%.