[Mark McLeod]

If you're listed in TIMS as either the "Main Contact" or the "Alternate Contact" (see the first attachment below), then you are supposed to get the emails whether you want them or not.
If you're not one of those then you do need to Opt-In under your TIMS account (2nd attachment).

The Opt-In does not actually include every message sent by FIRST, since some are specifically intended for the Main (+Alternate) Contact alone, and others are team specific communications, like event registration or Championship details. This particular email is an instance of that and was targeted just for the Main Contact with the idea that only the Main Contact in charge should be signing up for survey participation. I re-posted it because I've encountered many teams who use a Main Contact who isn't directly active with the team day-to-day operations, for instance a school administrator. In those cases the message often gets lost and the adults/students actually making team decisions never hear about it.

There's also the possibility of a subset of messages getting caught in a Spam filter, since some of the messages originate from a different FIRST email address.