Thank you for the suggestion. I've done that now.
I am in a situation where myself and others are project admins for multiple projects. We are not often in close physical proximity to the users whose names we need, and these users are not proficient with computers, so it's quite a hill to climb to 1) communicate with the users about needing their PT names, 2) remind them how to find it in the PT Help menu, 3) get them to reliably copy/paste or type it into a message (e.g. email), 4) get them to send the message.
What usually happens instead is that someone else (a go-between) gets the users' full names and sends them to me, then I try various combinations of First Last Middle, Last First Middle, etc. until the Registry website proposes a list of names that includes the right name. This doesn't work in the PT desktop app, because it has to first accept the input, then it will propose a single name (which is usually wrong the first time). There it's very much a guessing game.
In addition, neither the spelling of names nor the order of names is very standardized here, and Paratext is not that great in my experience at overcoming "misspelled" or "misordered" names. I am a very tech-savvy user, and I find workarounds. But this is not an efficient workflow for other project Admins who are much less patient and tech-savvy than I am, and who are not familiar with using the Registry site. They end up asking me to do it because they aren't able to make it work. This is why I'm proposing what I see as a streamlined option.