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It won’t find the slack channel I need and when I use the “Find channel” option I can’t search for it either because when I type it into the search field it doesn’t do anything. If I hit return, it just picks whatever channel is at the top of the list and doesn’t search for what I entered.
Assuming you've already made sure the Slack account connected to Airtable has access to the desired channel, you can manually force the channel selection by grabbing the Slack Channel ID and feeding that to Airtable automation as a "dynamic" field instead of a "Static" pick-list. Detailed solution in another thread.