The error you are getting is due to the fact that Mailchimp will only allow you to add an email address to a list (audience) once. If the email address already exists you will need to use the Update Member Information action instead of the Add Members to List Action.
I would recommend using the Show list members action to get the members from the list and run a cross-check with those email addresses you are trying to add/update. Use the Filter Array action to cross-check the email addresses. Filter out those that need to be added and those that need to be updated.
If you aren't sure how to use the Filter Array action, you may be interested in these YT Tutorials:
Did you know that the Condition action has a limit of 10 conditions? Although it might look like the Filter Array action can only accept one condition—this is not true. By using the advanced mode you can enter multiple conditions into a Filter Array action with an expression.
IN THIS VIDEO:
✓ 3 Ways to Use the Filter Array Action
✓ How to use the Scope Action to Group Actions
✓ How to Check the Number of Items returned from a Filter Array Action
✓ How to Cross-Reference Data in Excel with a SharePoint List
✓ How the Filter Array Action Works
✓ How to Access the Dynamic Content from a Filter Array Action
✓ How to Filter Items by a Key
✓ How to Filter Items by Matching a Substring
✓ How to Use Multiple Conditions in a Filter Array Action
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In this tutorial—I’m going to show you a quicker way to get the dynamic content from your Filter Array action—and it doesn’t require writing an expression.
IN THIS VIDEO:
✓ How to Loop Through Filter Array Results in Power Automate
✓ Using Apply to Each with Filtered Arrays
✓ The Easiest Way to Access Dynamic Content from Filter Array
✓ Fixing Nested Apply to Each Actions
✓ When to Use Value vs. Body Dynamic Content
✓ Simplifying Power Automate Flows with Filter Array
✓ Troubleshooting Filter Array and Apply to Each Issues
Hope this helps!
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