Welcome to the QuickBooks Community, @anibal-vetmedgro.
One reason this happens is because of server-side issues experienced by the app's service provider, leading to temporary disruptions in accessing the app's features. Additionally, the app itself might be experiencing technical difficulties or undergoing maintenance, which can impede its functionality.
Furthermore, I recommend reposting this question to the Intuit Developer's Community, where you can get help for issues regarding third-party apps. Here, we can answer questions about QuickBooks and other applications, but not about integration issues, especially if you're developing an app for QuickBooks.
- Follow this link:https://help.developer.intuit.com/s/
- Choose the QuickBooks Online tile.
- Click Ask as Question on the right.
Moreover, you can always refer to our Help Articles for further assistance whenever you need it. There are a variety of QuickBooks-related topics and instructions here.
If you have further questions about any errors upon using QBO app, you can comment below, and we'll respond to you as soon as possible.
