"Received invalid inputs" for Send an actionable message Slack automation

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4 - Data Explorer
4 - Data Explorer

I'm trying to create a weekly digest of invoices submitted in the past week. The idea is that people submit invoices via an Airtable form, then the automation sends a message to a Slack channel and a person in that channel presses a button shown in the Slack message once they've all been paid. Pressing that button then marks them all as 'Paid' in Airtable. 

I've gone through other similar threads about this and I'm not able to understand why I keep getting the 'Received invalid inputs' message. I'm quite certain that I've linked the correct Airtable record IDs (i.e. the ones found in the intermediate Find Records step). See screenshots, but any help would be much appreciated!

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7 - App Architect
7 - App Architect

It may have to do with sending more than 1 at a time. Can you try setting it up with the slack message as a repeating action for each record rather than it trying to send all records at one time?