Only the Pfizer vaccine (the original series of 2 shots) is licensed for children 12-17. Pfizer and Moderna are licensed for adults 18+. Bivalent boosters just received their EUA status and are not licensed for any age group. However, the licensed version, named Comirnaty, is not physically available in the US from what I understand. The FDA says that the Pfizer-BioNTech vaccine has the same formulation as Comirnaty but is "legally distinct." While many doctors and those in public health consider this a distinction with a difference, it's worth noting since Pfizer has had ample time to make it widely available in the US by now.