Why is the Auto End Live Chat not working?
The Auto End Live Chat node only works on the tree in an Inlet Channel (i.e. Facebook Messenger, Webchat, WhatsApp, etc). Please check if you have added the node in the Slack tree instead.
You could copy the node to the Inlet Channel tree with the copy node function in Advance Settings.
Please also check if you have added the livechat setting in the Inlet Channel and not in the Slack channel.
Refer to the documentation here for more details.