@emiwil This doesn't look like a Filter Array action.

This is a Filter Array action:

However, I don't believe that's the correct action to use for your case. You should use an expression to check and see if the person field is empty.
While building and testing a flow for MS Forms, it's recommended to use a Manual trigger so you don't need to leave Power Automate to trigger your flow.

Add Compose action to store the expression. Rename your actions to keep your flow organized.

Insert the empty() function.

Click on the dynamic content tab and insert the dynamic content for your person column. The name should match your column name.

Run a test. Review the outputs. The empty() function will return a true value if the column is empty.

The if() function takes three parameters. The first parameter is a condition that returns a boolan value (aka true or false), the second parameter is the value that is returned if the condition is true. The last parameter is the value returned if the condition is false.
if([true/false],[true value],[false value])
Compose your expression to suit your requirements. The true/false value will come from the expression created previously.
Click on the expression to edit it. Add if with an opening parenthesis to the start.

Press the down arrow key to go to the end of the expression. Add a comma. Tip: Pay attention to the tool tip as it bolds the text of the current parameter you are setting.

Insert the dynamic content of the true value or enter static text. If your value is a string of text, ensure you have single quotes around it.

Add another comma and enter the false value. Click on the dynamic content tab and insert the dynamic content from your form.

Add a closing parenthesis and don't forget to press update.

Run a test.
You can now insert the output of the Compose action into any subsequent actions.
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You might be interested in these MS Form tutorials:
How to Get Microsoft Form File Uploads Attached to an Email 📧
In this Microsoft Power Automate Tutorial I’m going to cover where file uploads from your Microsoft Forms are saved. I’ll also show you how attach the uploaded files to an email and how to dynamically name the files and customize the recipient of the email based on the selections made in your Microsoft Form. I will also cover how to handle responses that don’t include any file uploads.
IN THIS VIDEO:
‌✅‌ Two types of MS Forms
‌✅‌ Where Microsoft Personal (OneDrive) Form File Uploads are Saved
‌✅‌ Where Microsoft Group Form File Uploads are Saved
‌✅‌ How to Add a File Upload Question to an MS Form
‌✅‌ How to get a Microsoft Form ID
‌✅‌ How to get a Microsoft Form Response
‌✅‌ How to Get the Dynamic Content Microsoft Form File Upload Content
‌✅‌ How to handle Single and Multiple Microsoft Form File Uploads
‌✅‌ How to use a Scope action to Organize and Group Your Flow Actions
‌✅‌ How to Get the File Content from an MS Form File Upload
‌✅‌ How to Collect All Files Uploaded to a MS Form and Attach to an Email
‌✅‌ How to Handle MS Form Response When a File Isn’t Uploaded
‌✅‌ How to Create an Email Key
‌✅‌ How to Send an Email to a Specific Recipient Based on Form Selection
‌✅‌ How to Create a Dynamic Output Based on Form Selection
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How to Add Microsoft Form File Uploads to a SharePoint List Item
In this Microsoft Power Automate Tutorial I’m going to cover how to add file uploads to a SharePoint list item. First, I’ll show you how to get the file name and content from the File Uploads from your Microsoft Form, then I’ll show you how to add those files to a SharePoint item.
IN THIS VIDEO:
✅ Two types of MS Forms
✅ Where Microsoft Personal (OneDrive) Form File Uploads are Saved
✅ Where Microsoft Group Form File Uploads are Saved
✅ How to Add a File Upload Question to an MS Form
✅ How to get a Microsoft Form ID
✅ How to get a Microsoft Form Response
✅ How to Get the Dynamic Content Microsoft Form File Upload Content
✅ How to handle Single and Multiple Microsoft Form File Uploads
✅ How to use a Scope action to Organize and Group Your Flow Actions
✅ How to Get the File Content from an MS Form File Upload
✅ How to Collect All Files from Multiple File Upload Questions
✅ How to Handle MS Form Response When a File Isn’t Uploaded
✅ How to Attach an MS Form Single File Upload to a SharePoint List Item
✅ How to Attach Multiple MS Form File Uploads to a SharePoint List Item
✅ How to Attach MS Form File Uploads to an Email
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How to Get a Microsoft Form RSVP Response into a SharePoint List
IN THIS VIDEO:
✅ How to get a Microsoft Form Response into SharePoint
✅ How to get a Microsoft Form ID
✅ How to get a Microsoft Form response
✅ How to Build a Microsoft Form with Conditional Fields
✅ How to used Branching in Microsoft Forms
✅ How to format Microsoft Form multiple choice responses for a SharePoint multi-choice column
✅ How to parse a Microsoft Form multiple choice response as string of text
✅ How to convert a text response to a number
✅ How to use the Switch action
✅ How to create a custom email confirmation for a Microsoft Form submission
✅ How to Create a Custom View in a SharePoint list
✅ How to use the Compose Action
✅ How to write Power Automate Expressions
Hope this helps!
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