Hi,
I've started building a flow with the following pseudocode:
- The user completes a Microsoft Form (trigger)
- The flow collects the form responses.
- The flow populates a SharePoint list.
- The flow triggers an approval process (first to respond) in which multiple users can approve a decision.
- The flow triggers further actions based on the decision in step 4.
Steps 1-3 work fine but I'm getting stuck on the approval process and get this error:

The documentation indicates this step would "send the approval request to the email address in the Assigned To box". I've put in an email address (shared proxy mailbox) and multiple emails separated by semi-colons and received this error.
Please, can somebody help me?