Thanks for updating this thread, jluros.

I've reviewed our solved investigation about receiving an error -5000 when enabling a Merchant Account or processing e-invoices. Intuit's Product Investigations team has determined that the cause of this message has to do with how the QuickBooks Payments account is configured on the backend, in Intuit's systems.

The solution they left notes about was to get in touch with our Customer Care team so they can make sure your account is set up properly in our systems. Be sure to reference the investigation's case number (INV-57795) so they'll know what steps need to be performed.

They can be reached while you're using QuickBooks.

Here's how:

1. In your top menu bar, go to Help, then QuickBooks Desktop Help.
2. Click Contact Us.
   
3. Enter a brief description of the issue in our Ask a question (or tell us what's wrong) field.
   
4. Hit Continue.
   
5. Select We’ll contact you for a callback or Message Us to start an instant messaging session.

Be sure to review their support hours so you'll know when agents are available.

Please feel welcome to send a reply if there's any questions. Have a wonderful day!