Is there any reason for this error trying to connect my app from the sandbox, I got this error: Uh oh, there’s a connection problem. Sorry, but the app didn’t connect.

I'll ensure that the issue you're experiencing with connecting your app to your local server is resolved, dataglowtech. 

Since this issue pertains to an API (Application Programming Interface) concern, I'll recommend reaching out to our Intuit Developer team to diagnose the error you're receiving when trying to connect your app to the sandbox. They possess the necessary expertise and tools to carefully examine both the application and the server. Rest assured, you'll be well taken care of.

Here's how to reach them:

1. Go to the Intuit Developer Community page.
2. Click on Help.
3. On the Intuit Developer Support page, scroll down and choose a topic under What do you need help with?
4. Select Ask a question.
5. Input the details of your concern and click Ask.

Please let me know if you have any other QuickBooks concern by replying below. I'd be happy to assist you and ensure you receive the help that you need. Have a good one.