Are you only enlightened if you're able to share it with people?
No, it’s the opposite. You’re only enlightened when you have completely realized that you cannot, under any circumstances, share it with people, help anyone or perform any “transmissions” or give Shaktipats. For as long as you think on some level that it is possible you may even be deeply self-realized, but not yet enlightened.
Paradoxically, it doesn’t mean you cannot help, but on the opposite, that’s when your help becomes most effective. It’s just the complete acceptance that you’re not the one who’s helping, but rather, the person you’re speaking to is open to help themselves, and is using you as a tool, a conduit for their own realization or deepening thereof. So, your words can help and your presence can help, but you will absolutely lose touch with whether it’s happening at all or not, you won’t be able to tell.
As an anecdote, I have been visited by people who later said that their short visit to me marked a profound shift in their unfolding. They don’t remember what I spoke of and they don’t remember how it happened. They just know what happened afterwards. Sometimes it’s undeniable, like entering a spontaneous state of Samadhi for a few hours and sleeping for 16 hours afterwards. But I also know people who had a brief and shallow awakening experience and consider me utterly ignorant. They report that they feel absolutely nothing in my presence, other than maybe saying that they find me annoying, somewhat off-putting, and beaming with “bad energy”. In both of these cases, I had absolutely no idea what effect I was having on each of them, and I wouldn’t even have known unless they told me. I was aware neither of the profound shift happening in the first case, nor of the sensation of annoyance and “bad energy” in the second case. In both cases, only they knew.
As Osho said once, “only when you’re completely gone, you have jewels to share”. The true Shaktipat happens completely unbeknownst to the master. There is no effort and no intention. It will happen if you want it to happen, and it won’t happen if you don’t.