How do I change or remove a chat channel?

Each channel in Company settings (click your picture at the top right, then Company settings) shows its alerts and when it last posted, with:

• Change alerts, to tick or untick them, then Save;
• Send a test message, to check it still works;
• Delete, to stop posting to it. Alerts waiting to go are dropped.

If a post fails, the channel says why, after Last problem. When Slack, Teams or Google Chat was busy or couldn't be reached, Galley tries again after 1 minute and after 5. If the address no longer works, make a new webhook in the chat app, delete the channel and add it again. A company can have up to 10 channels.