I am a sysop on pt.wikipedia. Since at least 19th February I can not grant (nor remove) confirmed user flag. The group does not appear on the interface, see images below. Another sysop has been experiencing the same issue since today.
Also, the group does not appear on the dropbox menu of special:listusers, see third image below. (This happens in all languages I tried)
I have already tried to clean cache, change browser, OS, and computer.