PRIVMSG #<channel> :/ban <user> <reason> doesn't seem to work?

[BarryCarlyon]

Chat commands no longer work via IRC they have been moved to the API

Reference

This was announced and shutdown a while back, with the final shutdown in February

Deprecation of chat commands through IRC

Update (2023-02-08): We are implementing a phased shutdown to help developers test whether their applications are affected and make others aware who may not have seen previous communication. The timeline has been added below and the final shutdown date has been updated to to February 24. Twitch Chat and the Twitch API are two essential interfaces that third-party developers rely on to build innovative integrations for broadcasters and their viewers. Historically, there has been an unfortunat…