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I’m unable to RSVP for my son for events, but I can RSVP for myself. We are connected in Scoutbook, though. One of the committee members disconnected and reconnected us in Scoutbook (a sort of reset that one other parent reported as having worked for them), but it seems to have made no difference for me.
This is Troop 1347, and I has my role as a leader in Pack 1347 selected instead of as a parent to my son. I’m unable to verify if this works, though, because now the calendar has been wiped clean, so there are no events to RSVP to.