Two people with one name stay apart
When two members of a team pick the same name, each also shows a short tag that never changes, in the member list and on every message.
Names in a team are chosen by each person, so two people can both be Ana. Until now they looked the same everywhere, and you could not tell whose message was whose.
Now each of them also shows the last four characters of their member id, like Ana · 7f3a. The tag is tied to the person, not the name, so it never points at the wrong one. A name nobody else in the team uses shows plainly.