Discord currently uses phone verification as an anti-abuse tool. If our robo-hamsters sense something strange going on, you may be asked to complete a phone verification to log back in. Private servers can also set up a phone verification requirement for extra security.
The easiest way to report someone on Discord is to simply tell a moderator of the server that the inappropriate behavior occurred in. If you want to report something to Discord’s own Trust & Safety team, you’ll need to turn on the app’s Developer Mode.