Now is the time to get in touch with us, BjornCoopman.
Updating and reinstalling the QBO desktop application are the basic steps to resolve connection errors. Since you're still getting the same error, it's best to contact our Technical Support Team. They have the tools to check what's causing the issue, and will help you fix it.
Here's how to get their contact number:
- Go to this website https://help.quickbooks.intuit.com/en_US/contact.
- Select QuickBooks Online.
- Click the Solving issues & error messages topic.
- Click the Login sub-topic.
- Scroll down and click the Get Phone Number button.
Don't hesitate to come back if you need anything else.