Thank you for joining the thread, Enrique.
To sort things out, the Apps feature can't integrate with the QuickBooks Desktop (QBO) version, this is only available for QuickBooks Online (QBO) on searching for third-party applications.
Currently, only the Point of Sale can be linked to desktop versions of QuickBooks. And, for your QuickBooks Point of Sale system to run smoothly, ensure that the list of hardware is compatible with the device you've used.
Feel free to read this article for more details: Hardware to use with QuickBooks Point of Sale.
If you want to learn how to run several applications at the same time in your system. You can read through this article: System requirements for QuickBooks Desktop Point of Sale 19.0.
For additional questions about QuickBooks Desktop integrations, never hesitate to reply to this post. Keep safe and have a good day!
