Welcome to the Community space, @jsuttonlmt.
As of now, there's no official notice indicating that the Sync with PayPal app will stop working.
Could you please share the details of the email you received from QuickBooks?
It's important to verify the legitimacy of the email to ensure it's truly from QuickBooks. Please be cautious of fraud, scams, or misleading information.
For guidance on recognizing official Intuit communications, you can refer to the following articles:
Sync with PayPal, PayPal Connector, and Connect to PayPal are indeed different tools for integrating PayPal with QuickBooks Online. To better understand their differences, refer to this article: Difference between the three ways to connect PayPal to your QuickBooks Online.
If you have any further questions or need additional assistance, feel free to revisit this thread.