⚠️ Members are removed from archived public channels, but they’ll be retained in private channels if the channel is restored.
How to unarchive a channel in Slack
Search in the top bar for the channel you wish to unarchive.
Archived channels have the text
(archived)appended to their names.
Click the ℹ️ in the top right corner.
Un-archive #<channel name>to restore the archived channel.