Depends on which vaccine. Of the 5 meningococcal vaccines available in the United States: 3 are conjugate vaccines and 2 are recombinant protein vaccines. Meningococcal vaccines also vary by the number of serogroups they provide protection against. Both recombinant protein vaccines are monovalent vaccines. This means the Food and Drug Administration licensed them to provide protection against 1 serogroup (B). In contrast, the conjugate vaccines provide protection against 4 serogroups (A, C, W, and Y), making them quadrivalent vaccines. About Meningococcal Vaccines | CDC
amboss is just listing meningoccocal vaccine as conjugate, but cdc reference helps clarify more
vaccine schedule includes meningoccocal conjugate and meningoccocal B vaccine as separate and part of the schedule, seems like both are technically correct here
FA 2022 listing subunit and conjugate together in grouping and meningitidis included under
changing to reflect current vaccines in united states based on Vaccines for Meningococcal | CDC and amboss vaccine schedule