Let's perform some troubleshooting steps to get rid of the error message, faissal.
I've checked here on my end and there's no reported case about this one. The Business Validation Error -6000 occurs when QuickBooks Online (QBO) connections need to be validated by the system.
To rectify this one, let's try accessing QuickBooks Online (QBO) using a private or incognito window. Then, try syncing the product item again.
Here's how you can access private browser:
- Google Chrome: Ctrl + Shift + N
- Microsoft Edge: Ctrl + Shift + P
- Firefox: Ctrl + Shift + P
- Safari: Command + Shift + N
If it works, clear your browser's cache to delete those temporarily stored files on your browser's data. You can also use other supported, up-to-date browsers to be thorough.
If the same thing happens, let's try clearing Intuit-specific cookies to refresh website preferences on your program. Just proceed to Step 2: Clear Intuit-specific cookies from your browser section in this article: Clear cache and cookies to fix issues when using QuickBooks Online.
I've got a link here where you can find articles about running your business in your account: https://quickbooks.intuit.com/learn-support/help-articles/misc/03/help-articles-global?label=QuickBo....
I'm just one post away if you need anything else in QBO. I'll be around to provide additional assistance. Keep safe and healthy.
