This link is not working. https://app.sandbox.qbo.intuit.com/app/appcenter/findapps

Welcome to the Community, Madhankumar.

Thank you for reaching out regarding your concern with your third-party application in QuickBooks Online (QBO).  

Given that the Community is a public forum, we may not be able to confirm the feasibility of your inquiries. However, we can direct you to the Intuit Developer page, where APIs and other third-party application issues are answered. 

Our Community consists of engineers, developers, QuickBooks, and third-party application users who can share their experiences

and insights. 

1. Go to this link: https://help.developer.intuit.com/s/.
2. Select QuickBooks Online and click the Ask a Question button.
3. Provide the necessary information about your concern as you did on the Community page. 
4. Click Ask.

 They'll come to your aid and provide you with all the details that will allow you to deal with this scenario.

On top of that, if you'd like to learn how to transfer or disconnect an application from your QBO, see this article: Transfer app ownership or disconnect apps.

Feel free to let us know if you have further concerns about managing your third-party applications in QBO. We'll be more than happy to help you anytime. Have a good one!