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Toggle On Pagination
If you have more than 100 items in your SP list, you will need to toggle on pagination and set a threshold. The Get Items action returns 100 items per call by default, if you want more items returned per call you'll need to toggle on pagination and set a threshold. The threshold max is 5000.

Return Item Count
Whenever I use a Filter Query in a Get Items action, I always like to return the count of items returned in a Compose action. This is helpful when building a flow and can also be used to troubleshoot your flow.
Insert a Compose action. Add an Expression. Use the length() function.

Select the Dynamic content tab and insert the value dynamic content from the Get Items action into the length() function.

Run a test. Review the outputs of the Compose action to ensure the number of items being filtered out is what you are expecting. If it's not, you'll need to check your filter query.

Condition Check
Add a Condition action to your flow. If items have returned (aka there is number stored in the Compose action—that is not equal to 0), add the rest of your actions to the Yes branch. If not, do nothing.

You may also be interested in this YT Tutorial:
How to Send a SINGLE EMAIL ✉️ with multiple SharePoint list items | Build THIS Power Automate Flow
Building a Power Automate flow that will send an email with multiple SharePoint items can be a bit complex. In this video tutorial I’ll cover how to build a flow that will send a single email to each user with tasks that have been assigned to them. The logic in this flow can be applied to many different scenarios.
First, I’ll show you how to use a Filter Query to return items from your SharePoint list that meet your criteria. Then I’ll show you how to return a list of unique email addresses so that each user receives a single email. Lastly I’ll show you how to compose an email that will contain an HTML table with a list of tasks for each user.
IN THIS VIDEO:
✅ How to send multiple list items in a single email with a Power Automate Flow
✅ How to create a dynamic date range
✅ How to use the Convert Time Zone action
✅ How to use a Filter Query in the Get Items action
✅ How to count number of items in an array
✅ How to use the Select action to extract a users display name and email address
✅ How to create a unique list of email addresses
✅ How to use the Create HTML Table action
✅ How to customize the HTML Table with CSS styles
✅ How to use the Send an email (V2) action
✅ How to use the Append to String Variable action
✅ How to create a custom list of items for an email
✅ How to use the Send an email (V2) action
✅ How to display singular or plural text based on the number of items returned
Hope this helps!
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