1. 更改配置
先按照文档说的改配置，之后才能进行删除
https://api.mattermost.com/#tag/channels/operation/UpdateChannel
把config.json中的 ServiceSettings.EnableAPIChannelDeletion 改为true
2. 登录，并使用命令删除
登录命令：
mmctl auth login http://localhost:8065
然后使用命令删除，记得需要拼接team和channel的名字
mmctl channel delete m-one:test --confirm
3. 参考内容
[Solved] Error: cannot read user credentials, maybe you need to use login first
How can I delete a channel? (old but gold)