Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
@ConstanceGonsalves that means they have opted out of receiving email from your unit - they can change that if they desire by logging into scoutbook.scouting.org > click My Profile > at top click Email > at very top of page is a Messaging Opt-Out Toggle > if to the right and RED they are opted out.